河童の屁、カッパの屁、かっぱの屁
かっぱのへ、カッパのへ
kappanohe
JMdict entry #1778500
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expressions (phrases, clauses, etc.)noun (common) (futsuumeishi)
idiomatic expression
something easy to do; cinch; a kappa's fart
see: 河童・1