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1.
someone who does nonstop bitching and belly aching.
I wish that crabass would shut the hell up.
by Cinna January 05, 2005
 
2.
One who is being a complete retard for no apparent reason, also quite similar to asshat.

May also mean one who is a jerk about nothing.
"Damn, Steve is being a real crabass about his fridge, wouldn't let me get near it"
by Edward Franklin January 01, 2004