One who has had their head firmly inserted in their rectum for such a duration of time that they have become high on methane and now think that they are in fact brilliant masterminds of the universe here to solve every problem. Scientific studies have yet to conclude whether breathing your own methane for too long causes permanent mental retardation.
You: Hey what are you doing with these boxes?
Ass clown: Hey don't touch those! They're getting recycled because the earth is green mmmmmmmmmkay!?
You: They're in the doorway ass clown, move 'em!
by Herr der Qual January 21, 2015
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A Washington Metropolitan Area Transit Authority Employee.
"Those ass clowns waste tax dollars like they have their own printing press."
Those ass clowns couldn't pour piss out of their boots if the directions were written on the bottoms."
by snipet May 1, 2008
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A pompous and inconsiderate person suffering from illusions of importance and grandeur. This person may also exhibit general hostility toward others and display an air of genuine douche baggery if confronted. Such person may make reference to him/herself by using the third person.
Ex: The dude who drives the blindingly yellow Porsche convertible that double-parks each day in the filled to capacity parking garage is a real Ass Clown!

Ex: The dude who just spilled beer on a group of old ladies while plowing through three kids to catch that foul ball at the Royals v. Blue Jays spring training game is a real Ass Clown!
by EPWONG March 29, 2011
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Ass-clown (Ass klowne)

A group of people or individuals that like to dress up as clowns and cause mischief with their bottoms. This is usually achieved by sneaking up to a person or an "Ass target" as they are called, and expel gas on the person when they least expect it.On some cases when there are multiple Ass-clowns in one area they try to gang up on one person. They do this by circling the target while slapping their asses, and gradually shuffling closer to prevent escaping.
Call the police, that man has been attacked by an Ass-clown!
by Kev Schmitt June 13, 2009
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Someone who constantly nit-picks other people's mistakes while simultaneously is completely oblivious of their own.
Mason thinks his crap doesn't stink. He's such an ass clown.
by FRizzo August 6, 2005
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A complete jackass that does not realize how much of a tool he actually he. Does stupid shit constantly, and thinks people are laughing with him, when they are in fact laughing at him.
Did you hear that Chad Johnson wants to change his name again? That guy is a complete ass clown.
by aguy76 December 17, 2009
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