I have a lot of friends who are clacks, so it's okay for me to say this - Barack Obama is the most successful clack of all time.
by nnam_ecnarret March 14, 2016
Clack means to speak (about unimportant matters) rapidly and incessantly, originally from when Clacks' in England got their names for being royal court messengers. There is another version, of course, and that is it comes from the middle english work clakken, which comes from the Old Norse word Klaka which means thoughtless, prolonged talk...
by Chris Clack November 23, 2006
(Noun)
Mix of the words "classic" and "black" Used to refer to a man or woman portraying stereotypical African American behavior.
Mix of the words "classic" and "black" Used to refer to a man or woman portraying stereotypical African American behavior.
Your friend:"Yo sup mah nigga u bring me da greens so we can roll one bigga than king kongs fingas"
You: "Bro, stop being such a clack.
You: "Bro, stop being such a clack.
by Ravedavey February 14, 2012
by k-town clown May 17, 2011
v. to end interaction with someone who is not contributing to your well-being whatsoever; to be done with some one or something
E: D-Willi, what's going on with you and that chick?
D-Willi: I clacked her last night. Not worth my time.
D-Willi: I clacked her last night. Not worth my time.
by swifft January 25, 2008
A valve that allows a liquid to pass in one direction only. It has a flap or poppet device to prevent back-flow. They can be found on the old style windscreen washer where a plunger is pushed to operate it.
Another place to find one is on a boiler where the injectors force the water into it but the pressure must not be able to pass back along the supply pipe.
Another place to find one is on a boiler where the injectors force the water into it but the pressure must not be able to pass back along the supply pipe.
The water is mixed with the steam in the injector and passes through the supply pipe via the clack valve into the boiler.
by Le Macho August 30, 2007