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1.
An abbreviated form of the phrase "I don't care". This variant is typically used
a)by the African-America inner-city crowd.
b)by anyone, who wishes to make it seem as if they don't care, when in fact, they do.
AA1: Wanna go rape some unsuspecting white women?
AA2: Uncur
by atomicdonkey May 15, 2004
 
2.
A lazy ass way of saying.. "I don't care" - and that is simply all folks.

"Uncur" can also be used in a manner of which you really truly care but you only want to mask your feelings to sound careless and tough. (Try saying it while shrugging)
Quaneesha: J-DAWG!! Where you beeeeeeen?? I made some fried sssshiken and cone breeaaaheeaad fo ya.
*drops plate on floor*
AWWWW SHEEEEET, dayam baby I'm sorray.
John: (shrugs) Uncur.
by TheOrangeKrushOne March 25, 2004
 
3.
A compact, condensed version of "I don't care", more commonly used among those who ironically "don't care".
When asked where she wanted to go for dinner, Goth Girl Jane replied "uncur".
by McAffy March 24, 2004