なんでだよ

• 読み: なんでだよ
• ローマ字: nande da yo
• 発音: /naɴ.de da jo/

意味

Why though!? — an exasperated tsukkomi demanding an explanation for something illogical, absurd, or frustrating.

The quintessential tsukkomi retort in Japanese comedy and daily life. なんで (why) + だよ (assertive copula + emphasis particle) creates a forceful demand for logic where none exists. It is the phrase that bursts out when someone's reasoning is so absurd that you cannot help but challenge it. Like いやいやいや, it bridges comedy and real life — you might hear it on a manzai stage or in an office when a colleague suggests something baffling.

例文

1. 「歩いて大阪まで行こうぜ」「なんでだよ、新幹線あるだろ」
2. テスト範囲が倍になったんだけど、なんでだよ…聞いてないよ。
3. 彼女に振られた日にパソコンも壊れた。なんでだよ、今日呪われてる。

使い方ガイド

場面: friends, casual conversation, comedy

トーン: exasperated, comedic

正しい言い方

• 「今日サンダルで来た」「雨なのになんでだよ」 ('I came in sandals today' 'It's raining, why though!?')
• なんでだよ、昨日と全然違うこと言ってるじゃん。 (Why though!? You're saying something completely different from yesterday.)

避ける言い方

• 目上の人に「なんでだよ」はツッコミでも失礼 (Even as a joke, なんでだよ is rude to superiors — use なぜですか or どうしてですか)

よくある間違い

• Using なんでだよ in a genuinely angry tone when you mean it as a light tsukkomi — delivery and facial expression matter
• Forgetting that なんでだよ sounds masculine; なんでよ or なんでなの are more common among female speakers

起源と歴史

A foundational phrase in manzai (漫才) comedy, where the tsukkomi role involves sharply questioning the boke's illogical statements. なんでだよ has been a comedy staple for decades and is so ingrained in Japanese culture that using it automatically evokes the tsukkomi dynamic.

文化的背景

時代: Decades-old manzai tradition, timeless in casual speech

世代: All ages

社会的背景: Universal informal

地域メモ: Core to Kansai comedy culture but universally understood. Owarai (comedy) TV shows have spread manzai patterns nationwide.