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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.
Milk slap by Samuraignome June 4, 2023

Slap Milk 

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.
Slap Milk by ConLandfartface December 17, 2008

Slapping milk 

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!