To come up from behind an unsuspecting person and drag your knuckles against their ear repeatedly out of camaraderie. A good clart is defined as one in which each knuckle makes a distinctive "thud" sound. Occasionally the person's head is seized with one arm while the other hand makes the clarting motion.

Variations on the standard clart are the "Rapid Fire Clart" (AKA Power Clart) in which the knuckle striking action is repeated at a fast rate, the "Tremor Clart" in which the ear is actually siezed between the knuckles and jiggled, and the "Foreign Object Clart" in which the knuckles are substituted with any object conveniently laying around. Clarts are highly subjective to the skill and style of the clarter, and many variations exist which have not yet been documented.
Frenchie was doing a good job at work, and Bob honored him with the traditional Four-Fingered Clart.
by Jules_Verne March 15, 2007
Top Definition
Someone who's in the know about the GLC. (Goldie Lookin Chain)
"Nice one clart!"
by parsonist August 07, 2003
Taken from West Indian patois 'blood clot'. Blad was on the streets for years but a mate in Newport is now refered to as a clart thanks to the GLC.
Alright clart? Are yous safe or what?
by One Step August 07, 2003
greeting, piss take, or even insult!

not just used in Da port, but in Cardiff also!
woss appnin CLART! (Greeting)
Nice one clart! (Piss take)
You FUCKIN CLART!! (Insult)
by chuckla August 13, 2003
Sticky mud full of horse-muck. Tyneside
"Aa,m aall clarty!, man" = I'm covered in shit!
by James August 01, 2004
somebody who knows about the Goldie Lookin Chain (a Newport rap posse)
alright clart, what are you smoking?
by Jonny Weldon March 03, 2004
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