Van Halen Piledriver
A sexual act where a person is penetrated by a the headstock of a guitar, usually the person is lying on the ground with their legs over their chest so that the guitar can be driven straight down into them hence the "piledriver" term.
So I stole my ex-boyfriend's guitar and had my new boyfriend give me a Van Halen Piledriver with it, that'll show him to be a dick