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when you or someone close to you has abnormally low hanging balls and you proceed to dribble them against a hard surface and slam dunk them in their navel
you boys ready for the big slam junk competition tonight!?
inserting ones junk inside while having intercorse
totally junk slammed last night
A variation on a handjob, a slam junk is performed by jumping in the air with your arm outstretched, then slamming your hand, masturbation-style, onto the recipient's dick as if dunking a basketball. The more preferable variety of this position is performed with the recipient at a slightly higher elevation of 10 feet, although this is optional.
Yo, man, go lay down up there and I'll give you a slam junk!