in a jiffy . in a jiffy {adv. phr.}, {informal} Immediately; right away; in a moment. Wait for me; I'll be back in a jiffy. Categories: add yours {adv. phr.} {informal} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: I Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss