The sludge left behind by a girl after a night of sexual activity. The girl is often not the brightest or prettiest and is usually (but not always) riddled with AIDS or several other various STDs.
1. I've just seen your bedroom, that girl you brought back last night slatched everywhere!
2. "What smells?" "I've got that girls slatch all over my fingers, it stinks"
2. "What smells?" "I've got that girls slatch all over my fingers, it stinks"
by Taggy123 May 23, 2011