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1.
A celebrity that appears retarded.

Usually seen coming out of an 'of the moment' bar somewhere in New York, L.A. or London at 3am in the morning and trying to appear normal for the paparazzi, instead looking like a spastic.

Most celebrities bar a few fit in to this group.
Paris Hilton looked like the celebretard she is.
Jodi Marsh came out of the bar and showed her tits in her typically celebretard style.

by Ziggystardust73 July 06, 2006
 
2.
A demeaning and insulting term for a celebrity that is not liked. Often found on websites referring to hated celebs. Refers to a "retarded celebrity" although not retarded in the classical sense; retarded in the sense they are ridiculous, pompous, divas, demanding, fashion disasters, in rehab, generally disliked by the media or fans, or have a reputation of being snotty and difficult.
Lindsay Lohan is always sleeping around and in rehab; she's such a celebretard
There goes Paris Hilton; the Queen of celebretards
Headline: Which celebretard is cheating on their spouse?
by Pogmotoin January 09, 2008
 
3.
A talentless low level celebrity whose social status is either solely parasitic, or purely dependant on what they are willing to do or 'get out' for the cameras.
Proving herself to be a complete celebretard, despite laws prohibiting such Jordan got topless on a Maldivian beach.
by Bette Noir June 26, 2009