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1.
Somebody who is indeed being an asshole, but not necessarily having bastard nature (ie born during wedlock). Also abbreviated to shitbas
"Man, i must have left the car keys way out there in the jungle"

"Oh my god, you shit bastard!"
by the fatboy racer July 10, 2005
 
2.
Someone who doesn't have a father/born out of wedlock and Is being an inconsidarite ass hole.
"Shut up Kevin, your such a shit bastard!"
by brett August 24, 2004
 
3.
the best insult ever, can be used at any time, anywhere
'my god, you're such a SHIT BASTARD!'

'YOU SHIT BASTARD!'

'SHIT BASTARD!'
by samthepro September 13, 2007