tfw пердеть и бздеть — древнейшие слова.
https://en.wiktionary.org/wiki/Reconstruction:Proto-Indo-European/perd-
https://en.wiktionary.org/wiki/Reconstruction:Proto-Indo-European/pesd-
Proto-Indo-European
Root*perd- (imperfective)
to fart loudly, pass gas, break wind
Proto-Indo-European
Root*pesd-
to fart softly, pass gas, break wind