When one sticks their junk in the mail slot of someones door until someone sees it. Usually a sick prank
Person 1: Hey you know that barber shop down the street that Person 3 owns?
Person 2: Yeah.
Person 1: I totally junk mailed it while all his customers were in there.
Person 2: Yeah.
Person 1: I totally junk mailed it while all his customers were in there.
by TuriGuiliano April 07, 2011