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1.
When one equips themself with "Hulk Hands" and then proceeds to masturbate.

Also see: Super Smashturbating
I caught my twelve year old smashturbating with his Christmas present.
by The Powerhouse May 07, 2009
 
2.
Playing any Super Smash Brothers game by yourself.
Tony is smashturbating at home because nobody will play melee with him.
by slayertokey February 08, 2010