so-and-so . so-and-so(1) {pronoun}, {informal} Someone whose name is not given. Don't tell me what so-and-so thinks. Tell me what you think. Categories: add yours {informal} 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 Comment on this entry