1) When a male "diddles" oneself ; to whack off
2) The male form of diddle
3) To get sexual gratification through self-stimulation
4) Gripping your foreskin and repeating a constant up and down hand movement for a period of time until one cums and/or feels satisfied
Alex: Hey what are you doing?
Jimmy: AH Nothing get out..
Jake: Dude gross stop jiddle'n!
Alex: Man, not on the orange blanket...