The stanky smell that emits from an unclean female's crotch. Similar to nutsack musk on a male - both can be smelled from a distance on a hot summer day, or while either is doing the walk of shame the next morning.
Friend 1: What IS that rank stench!?
Friend 2: (points at a hooker) Eww, it's gotta be her bitch fog!
Friend 2: (points at a hooker) Eww, it's gotta be her bitch fog!
by YackityYack June 22, 2011