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protein stain 

Spermatozoa that has dried on a fabric or carpet or anything else.
"Damn when my wife sees all the protein stains on our new bed she'll know I've been fuckin' around'
protein stain by WILFONG June 11, 2003

protein stain 

Something that does NOT come out with just shampoo. Very sticky, irritating, but not flammable
Hey harry, this protein stain tastes nothing like caviar!!!
protein stain by Zack Morris May 13, 2005

protien stain

stefan go ask hendi wat a protein stain is
protien stain by vince May 13, 2005