fast food /ˈfæst ˈfuːd/noun 3fast-food adjective 1forms 2 noun3 •Restaurant food that is served quickly, often standardized and pre-prepared. •A type of food that is quickly made, but of low nutritional value; junk food.Everyone loves some junk food some of the time. That's why there are more than 140,000 fast food restaurants in the U.S. — 1986 •Anything standardized, quickly available, and inexpensive, often, of low value.The best evidence is that Sandals, the fast-food king of island weddings, now markets the term weddingmoons. — 2002 fast-food adjective1 •Of, pertaining to, or serving fast food. formsfast foods · fast-foods