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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.
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