slang A food truck, a truck or van outfitted to be a mobile kitchen used to prepare and sell food at various locations. Everyone in the office likes to get food from the roach coach that parks outside at lunchtime, but I don't really care for anything they serve. There's a roach coach that always comes around to the dorms and frats in the evening to sell munchies to the stoned college students.
n. a mobile snack truck. (The term was revived in the Persian Gulf War.) The roach-coach pulled up in front of the dorm every night about eleven.