An exclamation expressing delight or satisfaction, especially about delicious food.
Onomatopoetic origin, imitating the sound of pleasure or satisfaction; entered English in the 20th century and became especially popular after 'Yummy' was used in advertising. The exact original sound it imitated is unclear.
'Yum' is one of the newest words in English—it didn't exist before the 1900s, but it spread everywhere through comic books and advertising, showing how onomatopoetic words can suddenly explode into common use in modern times!
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