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a type of protein that works mainly on the balls and the scrotam in general. Some people might take scrotein if they have a small ballsack.
"hey leroy, how did you keep going after the 23rd ho?"

"well, iv been putting in the work and taking them scrotein supplements every day!, that shit really gets the jizz'm up"
by tmason January 23, 2008
1.) The proteins found in semen 2.) orally ingested semen
1.) I convinced my health-conscious gf to go down on me by saying she'd get 100% of her daily scrotein.

2.) This fag loves his scrotein shakes
by StutterMuffin October 18, 2014