Ass to Ear
A variation of the Wet Willy. Instead of wetting a finger with saliva from your mouth you insert your finger into your anus and then insert it into the ear of the victim.
Person 1 (after whispering to person's 2's ear): "Why does your ear smell like shit?"
Person 2: Oh, Matty went Ass to Ear on me about an hour ago"
Person 1: "Oh that's nasty you never go Ass to Ear!"
Person 2: Oh, Matty went Ass to Ear on me about an hour ago"
Person 1: "Oh that's nasty you never go Ass to Ear!"