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A water cup refers to someone who goes out to party but either drinks/smokes barely anything or stays completely sober. These people are called water cups because their cups never have alcohol in them. Can also be used as a verb to proclaim that someone's not gonna get fucked up that night.
"Yo, you ready to get fucked up at Jason's tonight?"
"Nah man, I'll go but I'll water cup"

"Bruh Chelsea's so lit, how much was she drinking?"
"She's a water cup, that's just her personality"
by Shithead69420 March 05, 2017
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