running gag
noun1
An ongoing joke, one that is regularly repeated or continued.
- Some groaners are converted into running gags, as when Joel and his brother (Max Greenfield) get in a duel of parting, one-last-thing-before-you-go affirmations.2014 June 26, A. A. Dowd, “Paul Rudd and Amy Poehler Spoof Rom-com Clichés in They Came Together”, in The A.V. Club, archived from the original on 07 Dec 2017: