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