From Longman Dictionary of Contemporary Englishfast foodˈfast food noun [uncountable] DFfood such as hamburgers which is prepared quickly and that you can take away with you
Examples from the Corpus
fast food• Obviously, the type of leadership qualities required for a fast food establishment are not the same as for an insurance company.• a fast-food restaurant• This boom in fast food is providing strong competition for both staff restaurants and school meal services.• In an era of fast food, subsistence incomes don't make for a culinary culture.• I lived on fast food, I smoked, I drank, I did drugs.• This is the first time a high street fast food chain has linked up with a theme park.• The fast food sector offered a £1 billion a year market in sandwiches alone.• Go to fast food places at peak hours, when extra cooks and cashiers are working.• Many roads are littered with fast food containers, diapers, wrecked and / or stolen cars, and animals. 