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1.
worse than worst; epitome of bad; ridiculously horrible
Shooping for curatins and pillow shams with the wife is NASCAR (adj)
by Evil Jedi July 19, 2006
 
2.
Used to describe something beyond terrible. Derived from the name of a pointless hobby (not sport) that involves making wide, left-hand turns for hours on end.
Oh man, that infection on my bathing suit area is totally nascar.
by BenB June 02, 2005