Etymology
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fruitcake (n.)

also fruit-cake, 1838 in the literal sense "a rich, sweet cake containing fruit," from fruit + cake (n.). Slang meaning "lunatic person" is first attested 1952.

updated on January 14, 2015

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Definitions of fruitcake from WordNet

fruitcake (n.)
a whimsically eccentric person;
Synonyms: crackpot / crank / nut / nut case / screwball
fruitcake (n.)
a rich cake containing dried fruit and nuts and citrus peel and so on;
From wordnet.princeton.edu, not affiliated with etymonline.