Picture gas that has built up inside a body and has to come out. It arrives with a noise, or a smell, or both. Nobody planned it, nobody can take it back, and everyone in the room notices. That mix — something pushed out from inside, unwanted, and impossible to ignore — is what the word carries everywhere it goes. Point it at a machine and the machine sounds dirty and rude; point it at a person and the person sounds like something nobody wants to sit next to.
From the word’s history
The source records a very old and unchanged word: Middle English ferten and farten, going back through Old English to Proto-Germanic and Proto-Indo-European forms with the same meaning. The noun is recorded as coming from the verb, which fits the picture: the act first, the thing second.
來源記載這是個非常老又沒變過的字：中古英文 ferten、farten，再往前經古英文到更早的日耳曼語和印歐語形式，意思一路相同。來源也寫明名詞是從動詞來的。這剛好對上畫面的順序：先有「推出來」這個動作，才有「一個屁」這個東西。
Wiktionary, "fart"
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