A sexual maneuver involving a guy fucking a girl from behind, and as he's fucking her he slips out mid-pump and replaces himself with a vagrant fresh off the street.
If perfectly executed the vagrant resumes with the same rhythym, which feels no different to the girl (except for added vaginal friction from the scabs and warts on the hobo's dick, and ass slaps are now somewhat muffled by the hobo's fingerless gloves).
The guy then puts himself in plain view of the girl who thinks he is fucking her. Little does she know she's about to get stabbed in the ass with a dirty heroin needle.
Last night I gave this slut the ol' Random Hobo.
That girl got Hobo'ed five times last semester.