catch phrase

A catch phrase (or catchphrase) is a word, phrase or expression recognised by its repeated utterance. Such memetic phrases often originate in popular culture and the arts, and typically spread through a variety of mass media (such as literature and publishing, motion pictures, television and radio), as well as word of mouth. Some catch phrases become the de facto "trademark" of the person or character with whom they originated, and can be instrumental in the typecasting (beneficially or otherwise) of that actor. This is especially the case with comedy actors.
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Noun
1. a phrase that has become a catchword
(synonym) catchphrase
(hypernym) phrase

idiom, popular phrase, buzz word There's a catch phrase for Newfoundland: The Rock.