屁と火事はもとから騒ぐ[hetokajihamotokarasawagu] it is often the originator of problems who kicks up a fuss or complains loudest
屁をひって尻窄め[hewohitteshiritsubome] there's no point squeezing your buttocks after you have farted
屁理屈[herikutsu] sophism
放屁[houhi] breaking wind
言出しっ屁[iidashippe] first person to say something

河童の屁[kappanohe] a cinch
屁放き虫[hekokimushi] fart bug
屁こき[hekoki] farting
屁っぴり腰[heppirigoshi] bent back