doing or having a pocket rocket is masterbating or "wanking/jacking off" inside ones own pocket, simply accomplished by reaching into the pocket of ones trousers, also known as a stealth wank. can be performend in public if user has masterd the techniqe.
this is an easy was to pleasure ones self while staying annonymus.
guy 1: dude why are you pulling a face
guy 2:we have lift off
guy 1:awww no way...POCKET ROCKET