胸熱

• Reading: むねあつ
• Romaji: muneatsu
• Kanji breakdown: 胸 (mune, chest) + 熱 (atsu, hot/heat) — literally 'chest-hot,' describing the physical sensation of being deeply moved.
• Pronunciation: /mu.ne.a.tsu/

Meaning

Deeply moved or heart-warming — describes the feeling of one's chest swelling with emotion.

Abbreviated from 胸が熱くなる (mune ga atsuku naru, 'one's chest becomes hot'), 胸熱 is used when something is so touching, inspiring, or emotionally powerful that you feel a physical warmth in your chest. It is especially common on social media and internet forums when reacting to moving stories, reunions, or impressive achievements. Popular among anime and manga fans as well as general internet users.

Examples

1. 幼なじみが10年ぶりに再会するシーン、胸熱すぎた。 The scene where childhood friends reunite after 10 years was too heart-warming.
2. 引退試合で最後にホームラン打ったの胸熱だった。 Hitting a home run in his last at-bat of his retirement game was so moving.
3. あの映画のラスト、胸熱で涙が止まらなかった。 The ending of that movie was so heart-warming I couldn't stop crying.

Usage Guide

Context: social media, internet forums, friends

Tone: moved, impressed, emotional

Do Say

• 昔の仲間が集まって一緒にステージに立つなんて胸熱だわ。 (Old friends gathering together on stage — that's so heart-warming.)
• このドキュメンタリー胸熱すぎて泣いた。 (This documentary was so moving I cried.)

Don't Say

• 上司への報告で「胸熱でした」は使わない (Don't use 'muneatsu deshita' in reports to your boss — too slangy for business)

Common Mistakes

• Using 胸熱 for trivially pleasant things — it implies a strong emotional impact, not mild enjoyment

Origin & History

Shortened from the phrase 胸が熱くなる (one's chest becomes hot with emotion). Became popular as internet slang in the late 2000s-2010s through 2channel and Twitter as an abbreviated reaction term.

Cultural Context

Era: Late 2000s internet slang

Generation: 20s-30s, internet-savvy users

Social background: Internet culture, otaku communities, general casual use

Regional notes: Used nationwide, primarily in written/online communication. Less common in spoken conversation than in text.