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clack

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.
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 September 7, 2007
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Clack

the act of terminating someone, usually with an STD of some sort.
Dude yesterday i clacked some guy for driving slow!
by DKproductionss February 7, 2010
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sha-clack

Said upon spotting a chick with "bomb-ass pooty tang." Nearby friends must respond either "Mamba Jamba," if they are in agreeance, or simply, "No."
Dude, sha-clack?
Mamba Jamba!
by nevy, devy, and pevy September 14, 2006
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clickitty clack

Guy1: What are you doing with that magazine?
Guy2: About to go clickitty clack.
by maxell123 March 4, 2011
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clickity-clack

1. Dude ur clickity-clack is noob
2. man i hate the clickity-clack noise a clickity-clack makes
by Aryk December 26, 2006
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Clack

Lick my clack
by Ben farrant January 11, 2009
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Clack

n. an abbreviation of the word 'cloaca', primarily to remove the long O.

In zoological anatomy, a cloaca is the pussy-asshole combo in certain animal species, such as birds. The word comes from Latin, and means sewer.
Lick my clack from front to back. Yeeeeah, taste it!
by pash_rash August 10, 2009
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