Hanging one's arse over a balcony and defecating on another's head.
Charlie dropped a Dirty Pigeon all over Lloyd, and his dinner and his girlfriend. It was the greatest Dirty Pigeon you ever saw.
by BigBear & Papa Smurf May 11, 2008
1 more definition
Dirty slag who has slept with every man in the office including peoples boyfriends and has an ugly face like a pigeon.
Oh look the dirty pigeon is bent over the boardroom table again...who is it this time? oh its my husband again
by mama f September 13, 2005