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1.
Meaning: Get cancer and die.
Used mainly as a comeback for when someone ticks you off.
A: Hahaha, you messed up big time.
B: Hey, gcad.
by Xzaf November 15, 2006
 
2.
get crunk and dance; getting crunk and dancing
Who wants to gcad tonight?; I'm totally down for gcad.
by Deuce Lombardo March 02, 2011