50
One that is a complete mistake to existence, and absolutely terrible at everything they do.
For those who play Call of Duty/other related video games:

"That guy I just knifed is an assclown."
"Get knifed, assclown."

For regular use:
"Wow, look at that guy. What an assclown."
by Kain91 April 26, 2010
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51
The sorry piece of herpes infested trash that is dating my sister. The said trash has the given name of Johnathan.
If your Ass Clown boyfriend comes in my home again, he will go head first off my balcony.
by BigT1985 June 21, 2013
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52
Someone who wastes the time of two or more people due to their inability to see what is obvious to the other two.
Joe just didnt get it, what an ass clown.
by Craid Smash July 11, 2003
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53
The most common rationalization for this term is "I am not a clown made of ass, how dare you accuse me of being such!" In all reality, the term "assclown" is much deeper than one would be lead to believe.

Assclown is possibly the worst insult you could give a person, and is in most cases synonymous with "failure at life."
"Oh, hey, yeah, you see that Russian guy? Yeah, he's an assclown."

"You're an assclown, Val."
by margaretlillian April 07, 2010
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54
Al Gore. Al Gore claims he invented the Internet. Al Gore is an Ass Clown.
Person 1: "What an ass clown."
Person 2: "No, that's Al Gore."
Person 1: "Exactly."
by superuser May 29, 2006
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55
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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56
Heres the REAL definition of assclown...
Someone that says a joke only he thinks is funny and no one laughs.
Neutron: How much for a beer?
Bartender: For you NO CHARGE HA HA HA!!!!!!!!!!!!
Neutron: ..................................... Dude ur an ASSCLOWN
by nirvvboner October 29, 2010
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