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 12, 2008
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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
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When a hobo takes a monstrous dump in the planter at the bar you're drinking at.
We were enjoying our fish and chips when a hobo dropped a dirty pigeon and ruined the whole day.
by 1badparatrooper July 23, 2019
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