Translation guide
How to say 'fart' in Japanese, from casual to polite, including related expressions and onomatopoeia.
おなら
fart (noun)
The most common, everyday way to say 'fart' among friends or in informal settings.
The standard, slightly polite but still casual word for 'fart'. Used by all ages.
A blunt, somewhat vulgar word for 'fart'. Often used in set phrases or by men.
Childish onomatopoeia for a fart sound. Used with small children.
あ、プーって言った！
Oh, you farted! (to a child)
How to refer to farting in polite conversation or formal contexts.
Even in polite contexts, 'おなら' is acceptable. There is no highly formal single word.
失礼、おならが出てしまいました。
Excuse me, I accidentally farted.
Euphemistic phrase meaning 'to pass gas'. More indirect and polite.
お腹にガスがたまって、ガスが出そうです。
I have gas buildup and feel like I might pass gas.
How to say the action of farting.
Standard verb phrase. 'をする' can be replaced by 'が出る' for involuntary action.
彼はわざとおならをした。
He farted on purpose.
おならが出ちゃった。
I accidentally farted.
Vulgar verb phrase. 'こく' is a crude verb for emitting something.
くそ、屁をこいちまった。
Damn, I farted.
Formal, technical term. Used in medical or scientific contexts.
食後に放屁することが多い。
I often fart after meals. (clinical)
Sound words for farting.
General onomatopoeia for a fart sound. Can be used as a verb with 'と' + '言う/鳴る'.
おならがブーッと出た。
A fart came out with a 'pfft'.
Softer, cuter sound, often used for children or small farts.
赤ちゃんがプーッとおならした。
The baby farted with a little 'poof'.
A silent but smelly fart. 'スカシ' means 'silent', '屁' is fart.
誰かスカシッ屁した？くさい。
Did someone do a silent fart? It stinks.
Phrases and idioms involving farts.
Idiom meaning 'a piece of cake' or 'no big deal'. Literally 'a kappa's fart'.
そんなの屁の河童だよ。
That's a piece of cake.
Sophistry, far-fetched argument. Literally 'fart logic'.
While おなら is acceptable in casual settings, in very formal situations it's better to use euphemisms like ガスが出る or simply excuse yourself without naming the act.
おなら is the standard, everyday word. 屁 is more vulgar and often used in set phrases or by men. Children and women tend to avoid 屁.
彼は屁理屈ばかり言う。
He always makes sophist arguments.