A costume you wear to a Science Fiction Convention, ComicCon, or other event just to wear around the halls of the event. You have no plan to enter the costume in a contest (though you might be asked to if they don't have enough participants).
This is just my Space Ranger Flight Suit, a black jumpsuit with a couple of patches on it. I'd never wear this Hall Costume in the Masquerade Contest.
by Ozzie321 August 28, 2019
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"My man gave me a GHOST COSTUME when he got back from Thanksgiving!"

"Nice!"
by froodley November 29, 2011
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the verb comes from the word "costum" so suck it
I costumized a cool card with glitter
by SuccSuccMyRainbowAss January 7, 2019
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I’m going to costumize “anxiety” for Halloween. It fits me well.
by Nya Nyx October 28, 2019
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A costume choice made popular by the swinging community in the late 90’s. The couple who arrives wearing this is meant to indicate to other swinging couples that their preference in the bedroom is anal sex. The person who wears the whiskey outfit is said to prefer to receive, where the cola wearer prefers to give. There are several variations of this costume since the 90’s, including Jack & Coke, Jack & Ginger, Whiskey & Cola.
Oh my! Can you believe Mark and Karen showed up in a Whiskey and Coke Costume? Do you think they know what it means?”
“Oh, I bet Mark knows what it means!”
by Bobby Butt Stuff October 16, 2021
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Someone who is an idiot. It was said after someone called me an ass hat. They deserved it because they are a cock costume.
You are such a cock costume for using the word ass hat.
by casemaster September 4, 2008
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