The English language contains a variety of words with sexual or scatological origins. Among them is the verb "to fart." In a blog entry for the Huffington Post, Anatoly Liberman, the author of Word Origins…And How We Know Them, discusses the origin of the verb. PG-13
The verb "fart" and its less audible companion "fist" appear in Old Germanic languages, including Icelandic, as well as Lithuanian, Sanskrit and Greek, leading etymologists to believe that the action was considered just as publicly unacceptible in ancient times as in modern.