Top Definition
nut sack deep double stuff (NSDDS). it is when achieving nut sack deep penetration one also inserts his scrotum into the vagina. This is the ultimate level of penetration by a male.
Tanner: Dude i was powning this chicks vag last night and she was down with letting me go NSDDS.

Brian: WTF is NSDDS?

Tanner: it is when i go nut sack deep on a chick and then lshe ets me shove my ball sack in her vag as well. really a delightful yet painful experience for the both of us.
by Tanner W. November 02, 2010
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