And just in case you wanted to know the etymology of the word fart is quite interesting:
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¬†(‚Äúnot in delicate use‚ÄĚ) 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 ‚Äúfisting‚ÄĚ). (This fist has nothing to do with¬†fist¬†‚Äúclenched fingers‚ÄĚ and consequently isn‚Äôt related to¬†fisting, a sexual activity requiring, as we are warned, great caution and a lot of tender experience. This reminds me of the instruction Sergei Prokofiev gave to his First Piano Concerto: ‚ÄúCol pugno,‚ÄĚ that is ‚Äėwith a fist‚Äô.)
Both words for the emission of wind (fart¬†and¬†fist) were current in the Old Germanic languages.¬†Frata¬†and¬†f√≠sa¬†(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 ‚Äúfist.‚ÄĚ 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).
The words were as vulgar then as they are today. Yet even grammar proves their antiquity. Some verbs (they are called strong) form their principal parts by changing the root vowel, for instance,¬†write/wrote/written,¬†sing/sang/sung. Others (they are called weak) add a dental suffix (d¬†or¬†t) in the preterit and the past participle, for example,¬†beg/begged/begged,look/looked/looked,¬†wait/waited/waited.¬†Strong verbs belong to the most ancient part of the Germanic vocabulary.¬†Fart¬†was one of them; however, it occurred in several forms. Modern German has retained¬†farzen¬†(now a weak verb, though¬†furzen¬†is the most common form) and¬†Furz¬†(a noun). In the older period, German also had¬†furzen¬†and¬†ferzan. Engl.¬†fart¬†goes back to¬†ferten, an exact congener of¬†ferzan. Although it was recorded only in the verbal noun¬†ferting, its existence can be taken for granted. I assume that the group¬†er¬†in it changed to¬†ar¬†in the same way in which¬†person¬†yielded its doublet¬†parson¬†and¬†clerk¬†became¬†Clark(in British English,¬†clerk¬†and¬†Clark¬†are homophones).