To expel gas from the digestive system, or the gas itself released from the body.
From Old English 'feortan,' related to German 'furzen.' The word has Germanic roots possibly imitating the sound itself. The meaning has remained consistent since medieval times.
Fart is one of the few English words that's literally onomatopoetic—it actually mimics the sound it describes! It's stayed basically unchanged for over 1,000 years because it's so perfectly expressive.
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