A bum swipe is a maneuver, usually dared, in where the person involves has to rub their buttock as inconspiculously as possible against a designated member of the public, ideally without getting caught. As a game this is best performed in a busy public enviroment like a bar or a cinema.
Scott just bum swiped that police officer. Fuck sake whit a dong.
Maurice: Here Scott, I dare you to bum swipe the receptionist.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.