open (up) a can of whoop ass (on someone)(redirected from open a can of whoopass on them)
open (up) a can of whoop ass (on someone)
rude slang To commit, engage in, or threaten physical violence (against someone). Sometimes said in a jocular or pseudo-serious manner. If that punk doesn't shut up soon, I'm gonna have to go over there and open up a can of whoop ass! My old man was the toughest guy in town when he was alive. He could open a can of whoop ass on anyone!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.