knock someone's block off
US /nɑk ˈsʌm.wʌnz blɑk ɔf/
UK /nɑk ˈsʌm.wʌnz blɑk ɔf/

1.
kafasını koparmak, ağzını burnunu dağıtmak
to hit someone very hard, especially in the head or face, often as a threat or in anger
:
•
If you don't stop bothering me, I'm going to knock your block off!
Beni rahat bırakmazsan, kafanı koparırım!
•
He was so angry, he threatened to knock the guy's block off.
O kadar sinirliydi ki, adamın kafasını koparmakla tehdit etti.