The humble fart crept, like a silent yet obtrusive guest, into our vocabulary long ago. It existed first as a verb, in use since the 13th century, and as a noun from the 15th. It is not currently considered polite, either in lexical form or in action; we provide a usage note which states "often vulgar," while the majestic Oxford English Dictionary says it is "not now in decent use." That being said, the word has been used by many of our finer scribes (and almost all of our four-year-olds) over the years.
He that lives upon Hope, dies farting.
— Benjamin Franklin, Poor Richard, 1736
A pox a de Horses nose, he is a lowsy rascally fellow, when I came to gird his belly, his scuruy guts rumbled, di Horse farted in my face, and dow knowest, an Irishman cannot abide a fart.
— Thomas Dekker, The Second Part of the Honest Whore, 1630
The spitting, the coughing, the laughter, the neesing, the farting, dauncing, noise of the musique, and her masculine, and lowd commanding, and vrging the whole family, makes him thinke he has married a furie.
— Ben Johnson, The Works of Benjamin Johnson, 1616