Slang for male ejaulate (semen), especially as a result of oral sex.

This term probably came into being upon the meeting of bodybuilder culture and its emphasis on whey- and other protein-based powders (dissolved in liquid resluting in a flavored milkshake-like drink), with contemporary gay culture.
Todd, come to my house after school. We'll hole up in my room and do some heavy lifting, hopefully ending in a protein shake or two winks.
by al-in-chgo August 19, 2010
After fellatio, before swallowing your partner shakes their head wildly.

Or after you blow your load, you grab and shake her head until she gets dizzy
I went home for lunch to give my girl a protein shake
by undercover brothertx January 04, 2012
when you take milk from a pregnant girl and mix it with your own semen and make her drink it
"I gave that bitch a protein shake last night!"
by Bodog February 22, 2008
(Noun) A misnomer for a hook up. Or a girl coming over to have sexy time.
Come over and make me a Protein Shake.
by Pookey Tayshwan Rios July 13, 2008
A sexual move very popular among private highschoolers in the New England area, especially MASSACHUSETTS and among hockey players who find this mixture to boost their energy level. The move starts off with a male squatting over his parter who is layein spread eagle on the bed. He should try to be at least 10 inches above her and situated above her naval. Then, he excretes as close to her navel as possible, the distance between her and the mans anus creates a nice impact when the feces hits her stomach, hopefully causing a splatter. Next, using his tongue, the man swirls the feces around the womans navel. If the woman happens to have a "cute".... outtie belly- button he should swirl it in the crevices and around it. Next, using his tongue as a sort of shovel he moves the excrement to the womans pussy and begins eating her out, incorporating the feces with her juices.Next the woman collects the mixture of feces and discharge and kneads it together (as if making dough) and plops it in the blender. With the proper mixture of ice cubes, soy milk, lemon juice, raspberries, and egg whites this makes an incredible energy supplement and when drank for 10 days straight can result in the loss of 15 pounds. To turn the heat up in the bedroom, a dinner of spicy Indian food (tikka tikka masala is a personal favorite) gets the digestion system kicking and the feces flowing... a more enjoyable splatter!
"Yo! great game today Mike"
"Thanks... I had a protein shake last night, if you know what I mean..."
"Shit! that explains it! Damnnnn boy you kinky!"
by hockeyfan101 March 11, 2008
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