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Is it related to this phrase: 问个屁/問個屁
Yes, it's 问个屁. P -> 屁.
问个屁 means Don't ask!. It indicates that you are annoyed by the questioner. It's a way to block their questions to annoy you any further.
It's a ruder way to say 别问了！
Politely, roughly 'nonsense'. Various less polite Anglo-Saxon expletives may be substituted.
问个屁 Ask/Talk nonsense.
You are wrong.
Wrong my foot!
Yes, the pronunciation of 屁 is pi (4th tone). Very close to the English letter P.
What are you asking for? This is nonsense.
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