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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"
water cup by Shithead69420 March 5, 2017
Water Cup is when your being a bit of an idiot so stupid in a way
friend 1: did you know the earth is flat

friend 2: YOU ACTUAL WATER CUP MAN WHAT U SAYING
Water Cup by Alehlete July 8, 2021

soda in the water cup 

When a cheap bastard or "badass" kid orders a free water and fills it up with soda in a fast food restaurant. Also a sick song by Attila.
"Bitch at mcdonalds just saw me put soda in the water cup."

"Omg I'm rank 2 badass cuz I put soda in the water cup!!!"

"Dude I just listened to soda in the water cup. Sickest shit ever. Fronz is a beast."

That’s a mean cup of water. 

That’s a mean cup of water — A mytho-legendary quote attributed to The Man in Black himself Johnny Cash when he performed live at San Quentin Prison.

Many people were against his performance in prisons especially prison guard unions who thought that a Johnny Cash prison performances would quite probably incite riots.

What actually happened was that Cash said: “If there are any guards still talking to me could you bring me a cup of water”.

After he finished drinking it, Cash destroyed and crushed the tin cup in which his water had been provided. Then he sang a song about the uselessness of San Quentin Prison and theories of rehabilitation called: San Quentin.

His Johnny Cash Live at San Quentin Album was certified gold on August 12th 1969 and in spite of the documented evidence to the contrary, the legend of the “ That’s a mean cup of water” quote is more powerful than what actually occurred.

But that’s the thing about a good and well told mytho-legendary story: it’s never what actually happened; it’s what SHOULD HAVE HAPPENED!!!!
That’s a mean cup of water. I felt tough like I’ve seen a thing or two; but I’ve never seen anything as hard as the cup of water I just drank!!!!

cup of water 

a term used for when something is bland or lacking seasoning or flavor. also used when something other than food is bland.
Guy 1: this food has no flavor
Guy 2: yeah this shit is a cup of water

example 2

guy 1: dude i'm looking good today
guy 2: nah hell nah you look like a cup of water with that white shirt
cup of water by mega male February 8, 2021

Cup of water 

A stupid person who acts overly intelligent without being intelligent themself.
"Did you see the President's State of the Union? What a cup of water!"
Cup of water by AlexisJA September 26, 2008