A phrase used to indicate that the
target is about to be introduced to a
whole world of pain. Specifically, you, by opening this can, are going to unleash the
power of whooping (that is, in the sense of attacking and beating, not in the sense of whooping cough) upon their sorry ass.
1. Specific use:
Jerry paused in
thought.
"For what you have
said about my mother, my girlfriend, and the proud ancestry of my forebears," he announced, "I have every intention of opening a can of whoopass."
2. General form:
"If <offending body> continues with <offending action>, it is totally
time to open a can of whoopass"