a knock is someone who occasionally does impulsive, immature, random things (such as buying a 12-pack of mountain dew game fuel). Knocks are basically people who don't care what other people think of them, and act like idiots.
There are 2 kinds of knocks: knocks that are just joking around, or knocks who are actually complete idiots. This word has been used to mean various things, but this use of the word was invented in Berkeley, CA, and brought to widespread use by students at berkeley high school
"dude!! I just downloaded 2 Andrew W.K. albums!"

"you are such a knock!!"
by D-Billin' May 03, 2010
a crackhead
I stayed up all night tweaking like a knock
by Anonymous June 15, 2003
to disregard, turn down; to ignore
Don't knock it until you try it.
You can't knock the hustle.
by Jarene September 17, 2003
A knock is someone who is a fiend for drugs of any kind. There can be weed knocks, coke knocks, pill knocks, etc... Also refers to when someone exhibits "knockish" behavior, i.e. fiending for drugs or just acting square. (see square) The word knock is derived from the "knock" of a fiend knocking on the door looking for drugs.
I was left with the decision of whether to bust some knocks and make that money or just kick it with these females.
by jay boon June 12, 2008
A customer or client; usually having to do with a drug sale.
I'll be back right after I bust this knock.
by Slacker641215 May 17, 2005
a song that slaps..or that sound crackin/hyphy..bay area
"that song is stupid knock"
by justine from the bay March 03, 2005
Someone who acts dumb; retarded; or just plain stupid
Mufiin is a king knock, she hit da five foot slap on Jabari.
by Carlos Banito November 08, 2005
(a) A sound device that outputs large amounts of bass.
(b) A bass heavy song.
"These new speakers that I got have some knock to them"

by DetroitSlang May 15, 2003

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