Dirty fucking butt-sex, often not consensual, usually resulting in much more dampness then the name implies. Also, as an adjective, it is the actual asshole-to-colon trail a big cock takes when butt-fucking someone.

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)