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When you rap your nuts around your buddy's cock and jack them off with your sack.

Note* If your buddy spunks on your sack, it means your totally gay.
I Nusterbated my buddy off and he jizzed all over my wiener. After he licked the jizz off he said, "Wow, Nusterbation is awesome!"
by Harlem1340 October 15, 2009
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