Punishment, in the form of a hunk of plastic that the band director bangs on with his conducting stick to keep time when the band keeps messing up the rhythm of a certain song. Usually makes an agonizingly sharp and loud sound, particularly for those poor suckers (like me) who are sitting in the front row of chairs.
Band director: " You guys keep screwing up this song! Joe, would you go out to my car and grab my knock block for me?"
Band members: "AAAGH! NOOOOOOOOOOO!!!"
Band members: "AAAGH! NOOOOOOOOOOO!!!"
by Blinx-the-kitty October 09, 2008

by JSSwaffy October 01, 2009

To hit someone, usually in the face. In this case, "block" is referring to a person's head and you are going to hit then so hard that there head would fall off if not attached!
If that dude over there wolf whistles at my girl again, I swear I'm going to go over and knock his block off
by IKnowTheLingo June 12, 2020

Having been punched in the face.
by Smoothal April 13, 2005

by shawn im so kool April 15, 2005

by Nicky Stevens May 13, 2010

by Txdiamondprncss May 24, 2006
