To hit someone, usually with the back of the hand.
I should clack you round the head for being such an idiot.
by B. Kizzle April 8, 2015
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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 29, 2009
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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 4, 2010
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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, 2004
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Hoping for a humerous release of wind you inadvertently fill your underpants with solid, rendering them unusable
Husband: "Ooops!! I just clacked my trunks"
Wife: "Oh, not again darling?! Here's your spare pair, now go throw those filthy ones in the bin"
by panda-niku May 17, 2010
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The action of hitting your cleats together to knock the mud off of them.
After the muddy football game i was clacking my cleats in the locker room and mud went everywhere.
by ChaDMcBaDD October 12, 2009
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