Originating from "shit bastard", however the meaning is slightly changed... a shit bastard is a person who is annoying for some reason, the phrase "shitbas" is used for describing something or an explanation of annoyance or displeasure.
Tom: "Man, i lost the car keys, way out there in the jungle"

Tim: "Argh Tom, you shit bastard, how could you do that?!"

***

"Crap, my CD is broken!"

"Na, don't matter, it was shitbas anyway..."

***

"Shitbas! Just hit my faffing head on the door!"
by the fatboy racer July 10, 2005
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To be heavily intoxicated as a result of freebasing, or smoking crack.
Man, I was up all last night smoking crack. I got totally shitbased.
by r the p June 19, 2008
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