Delicious or yummy food; usually spoken to child or pet during feeding or before a snack.
She gave her child some delicious numnums to snack on.
Good boy Fido. Now Come get your numnum.
Open your mouth (hangar) the airplane is coming in for a landing carrying some yummy numnums.
Actual definition is the feel you get when one gropes a women’s breast. Mostly one could just use the word to describe a women’s breast.
Oooh, I want to grab that numnum. Numnum so squishy!