Origin of feistorigin, originally , literally , a fart from Middle English f?st from Old English fisten, akin to Dutch veest, Old Norse fisa from Indo-European base an unverified form (s)peis-, to blow: see spirit
nounChiefly Southern US
Origin of feistVariant of obsolete fist short for fisting dog from Middle English fisting a blowing, breaking wind from Old English fīsting ; see pezd- in Indo-European roots.
The term feist is uncommon, but the derived term feisty is common.
Earliest sense is “fart”, and later “stink”. Sense of dog is 1805 American English, from earlier forms fice and fist, as abbreviation for fysting curre “stinking cur” (1520s), from Middle English fysten, fisten (“fart, break wind”) (mid-15th century) (related to Old English fisting (“stink”)). Old English term is from Proto-Germanic *fistiz- (“a fart”), presumably from Proto-Indo-European *pezd-, though this is disputed.
One explanation for the association of farting with small dogs is given in an 1811 slang dictionary, which suggests that the dogs were blamed for farting, specifically defining fice as “a small windy escape backwards, more obvious to the nose than ears; frequently by old ladies charged on their lap-dogs.”
Cognate terms include Danish fise (“to blow, to fart”) and obsolete Middle English askefise (“bellows”, literally “fire-blower, ash-blower”), from Old Norse; originally “a term of reproach among northern nations for an unwarlike fellow who stayed at home in the chimney corner”.