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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

protein stains 

i went to a hotel and there were protein stains on the sheets... disgusting
protein stains by mr happy January 5, 2004