The three pizza robots were character created by ventures58's short-lived "Microsoft Sam's Adventure Series".
The origins of these robots are unknown. Possibly created in Radar Overseer Gordon's laboratory.
Microsoft Sam's Adventure
The pizza robots refused to give a pizza with no cheese to Microsoft Sam. When Microsoft Sam refused the pizza, the two pizza robots shot down Sam's Roflcopter.
The pizza robots were destroyed after stealing someone's wallet. Microsoft Sam and Mike planted a bomb and the robots were destroyed in the sewer.