Pizza Delivery Guy is a minor character who only appeared in the Season 6 episode "Mac and Charlie: White Trash".
Mac and Charlie get stuck in a pool filled with garbage and order a pizza in the sense that the delivery guy would help them get out. The Pizza Delivery Guy, who is Asian, shows up, much to the dismay of Mac and Charlie, who were expecting an Italian. After neither of them have any money, Pizza Delivery Guy turns to leave, but Mac offers him his gold chain as payment. Mac tosses the chain up to Pizza Delivery Guy, who throws the pizza down to Mac and Charlie, the latter of which drops it. Pizza Delivery Guy throws a hose down to help Mac and Charlie get out but pulling them up. However, after realising that the gold chain is "fake as shit", he refuses to help them out and leaves.