How to say "bullshit" in Japanese

• ダウト
  nounCovers bullshit as an exclamation rejecting what someone just said — 'that's bullshit!'. At root it means 'I doubt it' or calling a bluff, as in the card game, challenging a claim rather than describing nonsense.
• 牛糞ぎゅうふん
  nounLiterally cattle manure or cow dung; its 'bullshit' sense is only a literal echo of the English vulgarism. For nonsense or lies it is seldom the word you want — it really denotes dung, not figurative rubbish.
• ホラ話ほらばなし
  nounCovers bullshit as nonsense talk: a tall tale or cock-and-bull story told to amuse or impress. Use it when 'bullshit' means exaggerated storytelling rather than a blunt cry of 'that's a lie!'
  ケビンが言いうことはほら話はなしばかりなので、誰だれも彼かれのことを信しんじなかった。↗

  Nobody believed Kevin because all he ever told were tall stories.

For bullshit as a cry of disbelief or 'that's a lie!', 「ダウト」 fits; for bullshit as exaggerated nonsense talk, 「ホラ話」 fits; 牛糞 is literally cow dung and only marginally matches the English vulgarism.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• ダウトI doubt it (card game)
• 牛糞ぎゅうふんcattle manure
• ホラ話ほらばなしtall story