When a dude has a one night stand with a chick, pulls out and then jizzes all over her. Works best when the girl is abnormally proper and hates the idea of jizz.
Guy 1: "Dude! Did you hear that Alison got flanaganed last night?"
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.