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3.
Most commonly used to describe aggressive, carnal sex which harkens to the exaggerated "ass-clap" sounds of mainstream pornography. Commonly accompanied with obnoxiously loud clapping of the hands for effect.

Its long form, "clack-a-lack," may also be used for special emphasis.

Rhymes with "gak," which, besides being an archaic Nickelodeon product, is a slang word for semen and/or ejaculating. Thus, to say "clack 'n gak" would be to suggest a "down and dirty" coital session in which the male only concerns himself with his own ejaculation and subsequent bragging rights.

May also be used to suggest any contact between two hard surfaces, usually instigated in an aggressive fashion.
Women (or men on the receiving end) may find the term "clack" offensive, as they are often referred as the pronoun "it" or "that" rather than named outright.

Thus,

"Dude, did you clack that shit?"
"Hell yeah I clacked it!"

Sounds much better than:

"Dude, did you clack her?"
"Hell yeah I clacked her!"

If the subject must be named in the sentence, then the pronoun "it" is still included and precedes the subject:

"Oh man, I'd love to clack it with the Olson twins."

Examples of non-sexual uses:

"Somebody tell this guy to scram before he gets clacked in the jaw."

"Damn, he clacked it out of the park!"
by jefeljefe January 04, 2010
 
1.
Clack is a slang term for bullshit which originated in south west london (Real Family)
1.Oi Fam Dun Gimme Da Clack!
2.Stop Clackin Before i Duppy you!
by Blaze(Real Family) July 11, 2009
 
2.
Fangirl abbreviation for the yaoi pairing Zack Fair and Cloud Strife from the video game Final Fantasy VII.
"Did you read that Clack fan-fic today? Zack and Cloud together are so cute."
by Ziggy Pasta November 28, 2009
 
4.
A term for the throat. Often used in Yorkshire.
"Got something stuck in me clack!"
by sas99 April 04, 2014
 
5.
Used in "American Idol" fandom, specifically by Clay Aiken fans: Clay photos, stories, performances, etc., that serve as a fan's "Clay fix". Derived from "crack."
"Dear God, did you see Clay's Rolling Stone cover? That was some major clack."
by Tak, the Hideous New Girl December 29, 2003
 
6.
(Noun)

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.
by Gewt Ningrich February 13, 2012
 
7.
Another word spoken in admiration for women's breasts.
Must be used in admiration and as a compliment. You see a girl who is well built and you say; Hmmmm, baby got CLACKS!
by Big Daddy Corleone September 07, 2011