a small vibrating dildo.

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.

1: little fast-ass Asian motorcycle (see also rice rocket, crotch rocket)
2: a small finger-sized vibrator

A small fast car

A girl, small in stature (pocket sized), yet having a dynamite personality (rocket like). A pocket rocket could also refer to a girl who is small but deadly

a small bottle of booze.

a pocket sized dildo ( 8==D )