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1.
Short for "What's up dog?" But which means "What's going on friend?" or "What's the latest news friend?"
Friend 1: Sup dog?
Friend 2: Not much. Sup with you?
Friend 1: Not much. Just chillin.
by Rene Villa April 07, 2003
 
2.
an "in-joke" between loz and jess and many other kisschasy fans
does this camera have supdog?
whats supdog?
nothin much, sup with youuuu
by lozdog November 19, 2006