Definition of fast food noun from the Oxford Advanced Learner's Dictionary

 

fast food

 noun
noun
BrE
 
; NAmE
 
[uncountable] Diet, Unhealthy eating habits
 
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hot food, such as hamburgers and chips/fries, that is served very quickly and can be taken away to be eaten in the street fast-food restaurants compare slow food See related entries: Diet, Unhealthy eating habits
See the Oxford Advanced American Dictionary entry: fast food