The jocular act of hitting someone in the face, usually gently, with a cold, plastic milk bottle. The bottle is generally at least 6 pints – large enough to cover one side of a person's face.

This action often just cools the victim's face in a pleasant way, rather than actually hurting them.
It's a milk slap, L.B.!
by Kokapetl January 19, 2009
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To Slap milk is to take a big bag of milk and slap your sexual partner in the face with it.
Jessica really wanted to slap milk with Kenny.
by ConLandfartface December 8, 2008
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getting "lit" or "turnt" as the new young hip folks say. this means u are getting excited, high off of marijuana, or drinking dangerous amounts of alcohol.
Dude 1: Yooo how was the party last night?
Dude 2: It was epic bro, we were slapping milk all night!
by FORTYTWOSIXTYNINE August 28, 2018
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When you nut in your hand till it fills halfway than go up to someone and slap them as hard as you can with the nut hand
Guy 1: Yesterday I gave my girlfriend a milk slap!
Guy 2: what happened?
Guy 1: she left me.
by Samuraignome June 5, 2023
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