L'etimologia di Fart

It cannot but come as a surprise that against the background of countless important words whose origin has never been discovered some totally insignificant verbs and nouns have been traced successfully and convincingly to the very beginning of Indo-European. Fart (“not in delicate use”) looks like a product of our time, but it has existed since time immemorial. Even the nuances have not been lost: one thing is to break wind loudly (farting); quite a different thing is to do it quietly (the now obscure “fisting”). 

Both words for the emission of wind (fart and fist) were current in the Old Germanic languages. Frata and físa (the accent over the vowel designates its length, not stress) turned up even in Old Icelandic mythological poems. According to a popular tale, the great god Thor was duped by a giant and spent a night in a mitten, which he took for a house. He was so frightened, as his adversary put it, that he dared neither sneeze nor “fist.” In another poem, the goddess Freyja, notorious for her amatory escapades, was found in bed with her brother and farted (apparently shocked by the discovery). oupblog.