Pickpocket (GURPS) is one of Fallout GURPS skills. See: Fallout GURPS.
The ability to steal a small object (purse, knife, etc.) from someone's person. Roll once per theft; if the target is alert, treat this as a Quick Contest vs. the target's IQ.”— Steve Jackson Games GURPS sources
With the abandonment of GURPS, Pickpocket (GURPS) was recycled into Steal.