Paul Walker -- Hookin' Up with Vin Diesel for Video Game Fix

Paul Walker fed his video game addiction with a pre-Christmas shopping spree that included a cameo from fellow 'Fast and Furious' dude, Vin Diesel.

Our gaming world sources (yeah, we got 'em) tell us Paul cruised into a Game Stop in Santa Barbara -- mainly to scoop up "Call of Duty MW3" ... which we're told he referred to as one of the most "bad ass" games ever made. No, duh.

We're told Paul also picked up a copy of "Wheel Man" -- which features his ole pal Diesel ... and is already being developed into a movie, starring Vin.