cum crust

(n.) dried man drippings usually found on fabric that was near a bloke’s knob just after he has splooged. Cum crust often exposes cheaters or serious bators. The typical “cum rag” (which can be a towel, a t-shirt, or a sock, among other things) is usually completely saturated with a cum crust.

“His dirty socks are always covered with a cum crust and stuffed under his bed.”

“After a night of heavy petting, my pants ended up with a major cum crust that you could see when I walked home.”