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"to vomit or retch,"1960, American English slang, probably imitative. Related: Barfed; barfing. As a noun, from 1966. Barf bag "air sickness pouch" attested from 1966.
An exclamation of strong disgust: You want to know what I think of it? Barf! (1970s+)verb
[Computer 1980s+; probably echoic]