A Tiggly Wiggly is a penis that is too short to masturbate by conventional methods. It can only be masturbated using a strumming motion. The technical term, microbation, is similar to the motion required to play a guitar, or base guitar, but requires holding the entire length within the palm of the hand.
The act of a parter/lover pissing on the roof of your mouth while you beat your shit to gay midget pornography. After the first stage of the act the man proceeds to chop his penis off and hang it on the wall.