Another term for male masturbation, especially when caught out in public by women performing that act.
When confronted the suspect explained to police that he had been Mixing A Protein Shake.
by jesster79 August 19, 2016
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Received a blow job
Guy #1: Really? Right there in the restaurant parking lot?
Guy #2: Yep, I guess she was still hungry so I whipped up a protein shake.
by TheBigHouse February 19, 2012
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Very Simple.

Its a healthy way to offer a girl a chance to give you head.
"Hi, oh wow. Your really in shape... How would you like to have a Protein Shake out of a Meat Straw©?"
by Platinum Romeo November 15, 2006
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A beverage made from the cum of Gerald Wang while he thinks about his fantasies of cherries and cumming on Minwoo.
"Where are you getting your nutrition?"
"Oh, I drink my special protein shake once a day!"
by KawaiiPotatoLikesCookieMesh February 13, 2018
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A synonym for semen, used in College Station Texas and at UC Davis
Tiffany decided to top-off on some Aggie Protein Shake after the big UT/A&M game.
by abam2 January 19, 2016
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The single male ejaculates into a cup, adds protein powder, milk, a banana, blends it up and drinks it to #GetThatProtein
Hey man, I noticed you don't have your protein shake today, you can have some of mine if you want?

Nah man, I hit that Protein-Shake last night, I'm good, thanks.
by Granddaddy Green October 14, 2019
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When you jack off into your mouth in order to get your protein for the day.
Yo Jordan I had the best protein shake ever this morning!
by Negromancer420 May 9, 2019
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