A formula which can be applied in order to make any Halloween costume, regardless of how plain or innocent, slutty enough to be given the "sexy" title by the Halloween costume industry. The formula, from the shoes up, goes as follows: fuck-me pumps or heels, stockings, a short skirt or booty shorts, and a top to indicate what the wearer is supposed to be dressed as. Accessories are optional.
To make a sexy police officer costume, we can apply the slutty women's Halloween costume formula: black fuck-me pumps, fishnet stockings, a blue miniskirt, and a blue button-up blouse with a police badge.
To make a sexy maid: black fuck-me heels, black stockings, black miniskirt, and a white apron.
by Ronny teh Pir8 October 12, 2008
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Figuratively it refers to a well known truth behind some concept (for example, "santa isnt real") that we collectively decide to ignore, because it ruins the fun.

It's in reference to mascot costumes worn by some poor soul to appease the masses, for example the underpaid part-timers staffing the costumes at disneyland

It's like, as a kid, pulling the "no, you didint just kill me cause we are just pretending" card when playing pretend on a playground

Alternatively, man behind the mask
Weeb A: you do know that most weebs are ironic about waifus, right? Only a relatively small amount of weebs actually think stuff like "this fictional high schooler is the love of my life".
Weeb B: Can we please stop talking about the man in the costume and get back to arguing about which underage girl is hotter?
by oan124 September 19, 2022
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"Costume Coup"

A facade of patriotism, revolution with zero substance other then intent to cause fear.
On January 6, 2021, it was little more than half off bargin costumes, teeshirts, hats and flags. A facade intending to cause fear without much substance. Just a Costume Coup.
by yepsureyeahyesduh January 7, 2021
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A term meant to be used with the movie "The Avengers", a costume boner refers to any point in the movie where Loki's long-horned helmet and cape suddenly appear. This usually happens when he is exerting some type of power, such as when he instructs an entire crowd of people to bow to him and they obey. Much like a penis might become erect when the average male gets excited, Loki's costume tends to appear in similar events.
Hey look, Loki's kicking some ass! Oh look, another costume boner.
by Masked-Guardian February 12, 2013
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trendy bands like My Chemical Romance who substitute "style" for substance by wearing ridiculous matching outfits...i.e. marching band uniforms circa 1930
costume rock is lame
by Devin Hurley December 30, 2008
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