yum /jʌm/exclamation 2adjective 1phrases 1 exclamation2 •Indicating delight at the flavor of food.Yum! This apple pie is delicious! •(informal) Indicating delight in other things.Grandpa bought an RCA Color TV. Mmm. See my Beatles in color. YUM. — 1965 adjective1 •(informal) Delicious.This apple pie is yum! Phrases with yum yuck someone's yumTo disparage someone's tastes or preferences.