yum-yum . yum-yum {interj.}, {informal} - Used usually by or to children, to express great delight, especially in the taste of food. "Yum-Yum! That pie is good!" Categories: add yours children delight used by children {informal} {interj.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 » In RussianTo section: Y Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry