(To Open Up a) Can of Whoop-Ass

What does the idiom “(To Open Up a) Can of Whoop-Ass” mean?

Definition:

To attack another person physically (very casual, slightly vulgar)

For example:

“We’ll discuss the problem. And if we don’t reach agreement, I’ll open up a can of whoop-ass.”

Notes:

This is often used as part of a threat, as in the example.

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