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When you sit on your hand until its numb then masturbate.
dude 1: so wut did you do last night?
dude 2: I had nothing to do so a did a numb job!
dude 1: sounds fun. I'm gunna try it.
by ~>El Padrino!<~ May 22, 2009
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A numbjob is tugging your dick with a twist. Most people would sit on their hand until it becomes numb, then jerking off, giving the feeling of someone else giving you a handjob.
Just giving myself a numbjob.
by Sam Leisenring August 28, 2016
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