What is Knock It Off?
1.
stop it, desist (often a stern command)
Knock it off you
freaking scallywag s.
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2.
to whack it off, polish your knob
"knock it off Tom!" Tom's mother said. Tom replied, "Bitch, I only do that to hot chicks that aren't blood related, DARRR."
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3.
Southern term meaning, to obtain, recieve, or buy something
Mayne, i just knocked off those new J's.
You see that chain? I'm gonna have to knock it off.