knock block off
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knock (one's) block off
To strike someone with great force, usually in the head. If you insult me like that again, I'll knock your block off!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
knock someone's block off
Sl. to hit someone hard in the head. Wilbur almost knocked Tom's block off by accident. He threatened to knock my block off if I didn't do as I was told.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.