Like fap fap, except when it's done by bronies (adult male fans of the kids show "My Little Pony: Friendship is Magic") while watching My Little Pony porn.
Brony 1: Hey dude, what took you so long?
Brony 2: Oh, um, well I saw some pretty hot Fluttershy drawings online, so, you know, clop clop. ;D
Brony 1: D: