McDonald's is known for its cheap meat -- but after a bad trip to the burger joint, one guy's wife allegedly became cheap meat.

McD's just got served by a guy who allegedly left his cell phone -- which contained nude photos of his wife -- at the Arkansas restaurant, only to find the nude pics posted online.

Phillip Sherman was assured by employees they'd keep the phone safe, yet the photos -- along with Sherman's phone number and address -- somehow found their way onto the Internet.