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Abbreveations for Mushroom Stamp and Nut Dangle. Usually performed in one action with the ND resting on the victims chin and the MS landing on their forehead.
Man, I totally did a MS ND to that chick I picked up last night she almost passed out from the impact.

You better shut the hell up before I MS ND your bitch ass.
by wart bung June 05, 2009
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