A restaurant menu is the nexus of a diner, a dinner, a chef and the suitably hospitable environment in which a meal is served.
Later, at a diner Dean apologetically says he only did it so they could have more money to travel on the road.
At the diner, he was asked if he thought Romney is a conservative.
"one who dines, 1815," agent noun from dine. Meaning "railway car for eating" is 1890, American English; of restaurants built to resemble dining cars (or in some cases actual converted dining cars) from 1935. The Diner's Club credit card system dates from 1952.