/ Dictionary / Index J Johnny-on-the-spot: Meaning and Definition of Find definitions for: John•ny-on-the-spot Pronunciation: ( jon'ē-on-u-spot', -ôn-), [key] — n. Informal. a person who is on hand to perform a service, seize an opportunity, deal with an emergency, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Johnny-jump-up Johnny Reb Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language