Able to use both hands with equal facility for the perposes of masterbation
"i can jackoff with my left hand or my right hand. I'm wankbidextrous".
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The ability to achieve equal measures of Wankisfaction with either the right or the left hand.
Ben: Mate Khaiyyam broke his arm the other day, he is screwed because it's his wanking hand as well.
Josh: Should be Wankbidextrous like me then shouldn't he!