gee whiz . gee whiz {interj.}, {informal} Used as an exclamation to show surprise or other strong feeling. Rare in written English. Gee whiz! I am late again. Categories: add yours exclamation feelings {informal} {interj.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: G Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry