Etymology
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barf (v.)

"to vomit or retch,"1960, American English slang, probably imitative. Related: Barfed; barfing. Barf bag "air sickness pouch" attested from 1966.

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Definitions of barf
1
barf (v.)
eject the contents of the stomach through the mouth;
Synonyms: vomit / vomit up / purge / cast / sick / cat / be sick / disgorge / regorge / retch / puke / spew / spue / chuck / upchuck / honk / regurgitate / throw up
2
barf (n.)
the matter ejected in vomiting;
Synonyms: vomit / vomitus / puke
From wordnet.princeton.edu