salad days . salad days {n. phr.}, {informal} The period of one's youth; a period of inexperience. He was silly and immature during his salad days in high school. Categories: add yours {informal} {n. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: S Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss