catchphrase

Etymology

From catch + phrase, from the notion that the phrase will catch in the mind of the user.

noun

1. A repeated expression, often originating in popular culture.
   Frequently, catch phrases are not, in the grammarians' sense, phrases at all, but sentences. Catch phrases, like the closely linked proverbial sayings, are self-contained, as, obviously, clichés are too. Catch phrases are usually more pointed and ‘human’ than clichés, although the former sometimes arises from, and often they generate, the latter. Occasionally, catch phrases stem from too famous quotations. 2003 [1985], Eric Partridge, “Introduction to the First Editon”, in Paul Beale, editor, A Dictionary of Catch Phrases, 2nd edition, Routledge
   For Tigger, he created a slight lisp and laugh, crediting his British wife with Tigger's "TTFN" catchprase - "ta-ta for now", itself coming from BBC radio comedy It's That Man Again. May 14, 2005, “Disney's Tigger voice dies at 82”, in BBC News website
   The former head of BBC comedy claims catchphrases are out of fashion. But as Corporal Jones might say, ‘Don’t panic!’ 2018-09-18, Brian Logan, “Catchphrase comedy is dead. Am I bovvered?”, in The Guardian
2. A signature phrase of a particular person or group.