When you place both your feet directly above in the two corners of a door cause your dick and balls to hang down. An unsuspecting girl walks in the room, opens up the door and gets hit in the face with the flopping sack and cock, usually causing her to squeal in disgust.

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)