Weirdest Halloween costumes for adults 2018

The weirdest, craziest and most bizarre Halloween costumes you can buy online.

Halloween is traditionally about mourning the dead and honouring the lives of saints and martyrs. How we ended up with slutty nurse outfits and morphsuits is anyone’s guess, but it is an infinitely more fun holiday as a result.
You know what will make this Halloween more fun? A rockin’ costume that will have people talking about you for years to come. How do you find such a costume? You could spend hours trawling online costume stores for the funniest, craziest and weirdest outfits or try to recreate a Miley Cyrus get-up for that extra shock-factor. Or you can check out this list we prepared in advance. You’re welcome.

But Mommy I Don't Want To Grow Up Adult Costume

1. Mommy, I don’t want to grow up

Babies have it good. They sleep for about 70% of the day, eat enough food to gain roughly triple their weight and everyone’s always insisting they’re adorable. Why would anyone want to give that up?

  • Inflatable legs and torso
  • Doesn't come with shoes or socks
  • $9.95 delivery fee Australia-wide
  • Freudian slips optional

Buy it from costumes.com.au

lips and tongue mens costume

2. Tongue and Lips

The plan with this costume is to go around asking people if you can lick them. For real. It’s a sure-fire way to make friends.

  • Gold standard costume
  • One size fits most
  • $7.99 delivery fee Australia-wide
  • Tongue-in-cheek costume

Buy it from Costume Box

trojan magnum

3. Magnum XL

This costume comes with an extra large dose of responsibility. You have to go around to every couple that looks like they’re getting a bit too into each other and make sure they’re being safe. Trust me, they will thank you for it… eventually.

  • Officially licensed Trojan project
  • $9.95 delivery fee Australia-wide
  • One size fits most adults (that's what she said!)
  • Slogan: practice safe sex

Buy it from costumes.com.au

banana flasher

4. The Banana Flasher

Indecent exposure in Australia can land you in prison for up to six months, plus a hefty fine. With this outfit, you can experience the thrill of flashing your banana while only flashing… well, your banana.

  • One size fits most adults
  • Comes in two pieces
  • Premium quality costume
  • Compensating for something?

Buy it from costumes.com.au

thumbsup inflatable'

5. Thumbs Up Willy

Thumbs Up Willy is a nice guy, but it’s not his fault his two closest friends are nuts and won’t leave him alone. On the plus side, he’s hard to beat when it comes to beer pong. Don this outfit and you’ll be swimming in penis puns all night.

  • Limited stock
  • Internal fan allows costumes to be inflated (erect) within 60 seconds
  • Battery pack keeps costume inflated for seven hours
  • Thumbs up optional

Buy it from Ozgameshop.com


6. Spam

This is basically an invitation to go around asking everyone if they want to chat to single girls in their area. Bonus points if you cut them off mid-sentence with flashing lights if possible.

  • Made of polyfoam
  • One size fits most
  • $9.95 delivery fee Australia-wide
  • Delicious

Buy it from costumes.com.au

pregnant prom queen

7. Pregnant Prom Queen

What’s better than a little crossdressing for Halloween? Getting crowned prom queen and the joys of childbirth. Now you can enjoy all three with this costume. Bonus: The promo shot is super-realistic. Pregnant women should not be wearing those heels for too long.

  • Includes bodysuit, top and skirt
  • One size fits most
  • Free express shipping
  • Sugar daddy/mama not included

Buy it from Costume Box

inflatable ballerina

8. Inflatable Ballerina

You don’t need multiple personality disorder to nail a Swan Lake performance. Step into this beauty and feel the kind of grace and elegance only ballerinas feel. Well… morbidly obese ballerinas...

  • Inflatable using an internal fan
  • Batteries for fan not included
  • One size fits most
  • Dance lessons not included

Buy it from costumes.com.au

super sperm

9. The Super Sperm

You dress up as Super Sperm, your friend dresses up as the Magnum XL and you’ve got yourself the makings of an epic battle sure to draw crowds. Think of the YouTube views a video like that would bring in!

  • One size fits most
  • Closes with Velcro
  • Free express shipping
  • Cannot fly

Buy it from Costume Box


10. Tinkerbelly

Nothing we say here can make this costume any funnier, any weirder or give it any kind of reasonable context. There is no reason not to buy one right now. Guaranteed to make lasting – possibly traumatic – memories.

  • One size fits most
  • Includes tank top, shirt, tutu and wings
  • $9.95 delivery fee Australia-wide
  • Make all others green with envy

Buy it from Costume Box

More costume inspiration

Halloween costume deals and coupons - no matter WHAT you're planning to dress up as this year

Costume One Costume One

Costume One costumes for under $40

Check out the range of costumes available for $40 or less.

Last verified

Costume Collection eBay Store Costume Collection eBay Store

Up to 60% off sale and clearance stock

Shop the Costume Collection eBay store's sale stock for up to 60% off your costume

Last verified

Popular Halloween category coupon codes

Last checked Code description Code
7 Sep 2015 Costume One costumes for under $40 ********
17 Sep 2015 Up to 60% off sale and clearance stock ********

Kelly Vieira

Kelly is a digital marketing specialist for finder.com.au and mostly handles email marketing. She also dabbles in writing occasionally and has covered topics like tech reviews and mobile content for lifehacker.com.au and macworld.com.au.

Was this content helpful to you? No  Yes

Related Posts

Ask an Expert

You are about to post a question on finder.com.au:

  • Do not enter personal information (eg. surname, phone number, bank details) as your question will be made public
  • finder.com.au is a financial comparison and information service, not a bank or product provider
  • We cannot provide you with personal advice or recommendations
  • Your answer might already be waiting – check previous questions below to see if yours has already been asked

Finder only provides general advice and factual information, so consider your own circumstances, or seek advice before you decide to act on our content. By submitting a question, you're accepting our Privacy & Cookies Policy and Terms of Use, Disclaimer & Privacy Policy.
Ask a question
Go to site