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2.
The use of perfume or cologne to hide the smell weed.
Guy 1: What's that smell?

Guy 2: That's probably my costume I had to put it on I just boxed the car.

Guy 1: Logical.
by Spano_13 February 07, 2011
 
1.
an outfit...the clothes you wore outside your house
"Throw on some drawers and pick out a costume
I think ill rock these blue jeans and this tee shirt
And whats a little polo sport gonna hurt?"-Gym Class Heroes
by b to the rizzle June 05, 2007
 
3.
A costume is when your lack of clothes represents a person, place or thing.
My dog's costume was being naked so she looked like the Taco Bell dog.
by ACGrace April 29, 2011
 
4.
Someone that puts up a front. Somone pretending to be someone or something else and it is not even Halloween. Puting on a Costume for us sort of speak.
Look at this guy what a Costume!
by Anonymous August 09, 2003