Top definition
An interjection when someone commits an action that resulted in well... utter failure (or disapprovment).
Guy#1: " I bet i can run all the way from one end of the tack field to the other in under 45 seconds."
*runs halfway and trips falling on his face
Guy#2:"HAHA!! FAILZ"
by KAMIKAZEBEOTCH May 29, 2009
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