look up any word, like cunt:
 
1.
stop it, desist (often a stern command)
Knock it off you freaking scallywags.
by Light Joker October 17, 2005
 
2.
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.
by Spencer Evans April 18, 2005
 
3.
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."
by BitchinChris69 October 31, 2006