Third-person singular or plural form of 'barf,' meaning to vomit.
Barf is onomatopoeia or imitative slang from mid-20th century American English, likely mimicking the sound of vomiting. It became widely popularized in the 1970s-80s.
Barf is a perfect example of a word that sounds like what it means—it's onomatopoeia that made its way from teenage slang into dictionaries, showing how vivid, imitative words can become legitimate even when they start as informal expressions.
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