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Noun. General term for a person whose behavior falls on the spectrum between jackass and assclown, usable in settings where profanity might be inappropriate (kids/parents, workplace etc.)

Verb. The act of disrupting some otherwise useful or enjoyable activity by being a clownjack.

Also clownjackery (n.), clownjackerous (adj.), ownjackerously (adv.)
"The movie was good, but some clownjack sitting behind me wouldn't stop talking."

"Bill totally clownjacked our staff meeting this morning."
clownjack by Anonymous_clownjack January 24, 2016
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Verb. to conversation hijack, as in stealing a conversation, changing the subject, and not allowing anyone else to speak. Other forms of the word include conjacker, conjackee, and conjaction.
Will: My best friend just found out his gf has been cheating on him for a month with a guy from VCU...
Gabe: Oh my gosh dude I'm so--
Brian: I know a kid from VCU, we grew up together in New Hampshire, we were on the same soccer team, and this one game...
Will: Goddamit Brian conjacked me again!
conjack by WM233 October 1, 2010

Clownfuck 

During sex, one party gazes at the other, grinning like a deranged clown. Generally used as a tool to ensure the receiver of the clownfuck will never be interested in you again.

can be referred to as "clownface"
"How did it go with Anne the other night?"
"Well, she clownfucked me..."
"Did it work, are you gonna call her again?"
"Of course not, I can take a hint, I mean who wants to bang a girl that stares at you like 'It the Clown', I felt like I was having sex with Gary Busey wearing Joker make-up"
Clownfuck by The Latvian Riverbank September 21, 2011

clownfucker 

somebody who is both incredibly stupid and extremely unlikeable. A total joke.
What kind of clownfucker borrows your credit card and uses it to rent a hotel to bang your wife in?
clownfucker by Christine June 25, 2004

clownbuck 

The United States dollar, defined as a "clownbuck" due to the inaptitude of the U.S. Federal Reserve to preserve it's value.
The Federal Reserve printed up 8 billion clownbucks today.
clownbuck by falser December 29, 2005

clownfaced 

When you are drunk to the point of acting like a clown, also when you are drunk your cheeks often turn red like a clown.
Bro, I was so clownfaced last night i couldn't tie my shoe.
clownfaced by Matt Rumley December 22, 2008

clowniac 

a maniacal social clown. the kind of person that would wear ed hardy and have a slight personality disorder.
I hate that guy he's always coming to the club and spazzing out. he's such a clowniac.
clowniac by my turn May 15, 2010