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the act of one male inserting his testical into a females vagina, often done in the pile-driver position.

warning- only for the flexible
girl-"I want you to dip your balls in me"
guy-"No shit bitch thats called the nutsack slam dunk go look it up"

{does the nutsack slam dunk}

girl-"that was amazing you really know how to dunk those balls I think i-"
guy-"not now bitch, im in the fucking zone (continues to dunk while cutting her off in mid-sentance)"
by zohan pubes December 14, 2010
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