A sexual act in which two consenting males (of legal or illegal age) sit on their hands until they become numb. When both achieve sufficient stiffness of their penis they simultaneously jerk each other off until the point of ejaculation. At this point both loads of cum are then blasted into each others faces.
This game can be played by oneself, but is usually referred to as the strange in such cases.
My little brother woke up and said his hand was asleep so I sat on my hand for a while and put our sleeping hands to use and played numby dicks all morning.
I would die to have played numby dicks with Simon Birch.
when your sitting at school/work wearing tights and they itch like mad, then when you think no ones looking you scratch yourself and everyones like wtf
half way through my maths exam i had a numby bummy, i went to scratch myself and john saw :O