Stump Grindin' occurs when a man and a woman have sex in the missionary position. The man has his legs cut off at the knee. This poses an awkward thrusting resembling that of midget porn in fast forward.

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)