slitch

From Middle English slicche, from Old English *sliċ, from Proto-West Germanic *sliki, *slīk, from Proto-Germanic *slikiz, *slīką, from Proto-Indo-European *sleyg- (“to be slick; slide, slip”). Related to Dutch slijk (“mud, mire, slush”), German Low German Slick (“mud, silt”), German Schlick (“silt, mud”). Doublet of sleech.

Blend of slut +‎ bitch; coined by American science fiction author Robert Heinlein in 1982 in the novel Friday.