バキバキ

• Reading: バキバキ
• Romaji: baki baki
• Pronunciation: /ba.ki.ba.ki/

Meaning

A cracking or snapping sound — and modern slang for being extremely muscular or ripped.

バキバキ originally describes the sharp sound of something hard cracking or breaking — snapping branches, cracking knuckles, or breaking boards. In modern slang, especially fitness and social media culture, バキバキ has come to mean extremely muscular with visibly defined muscles, like a bodybuilder whose muscles look like they could crack stone. バキバキに割れた腹筋 (baki baki ni wareta fukkin) is the classic phrase for shredded abs.

Examples

1. 首をバキバキ鳴らすの体に悪いらしいよ。 I heard cracking your neck is bad for you.
2. あの人バキバキに鍛えてるな、すごい体してる。 That guy is seriously jacked — what an insane physique.
3. 朝起きたら体バキバキで動けなかった。 When I woke up this morning my whole body was so stiff I could barely move.

Usage Guide

Context: fitness, sounds, body condition, social media

Tone: intense, impressed, physical

Do Say

• 腹筋バキバキじゃん！何のトレーニングしてるの？ (Your abs are shredded! What workout do you do?)
• 枝がバキバキ折れる音がした (I heard branches snapping loudly)

Don't Say

• フォーマルな場で「バキバキ」は粗い (Using 'baki baki' in formal settings sounds rough — use 鍛えられた or 引き締まった for muscles)

Common Mistakes

• Not distinguishing the three meanings: cracking sound, muscular physique, and body stiffness — context is key
• Using バキバキ for soft or quiet sounds — it specifically implies hard, sharp cracking

Origin & History

Traditional onomatopoeia for cracking sounds. The muscular/ripped meaning emerged in fitness culture in the 2010s, popularized through social media, YouTube fitness channels, and manga like Baki (刃牙). The stiffness meaning (体がバキバキ) also developed naturally.

Cultural Context

Era: Traditional (sound); 2010s (fitness slang)

Generation: All ages (sound); Fitness community and Gen Z (muscular meaning)

Social background: Universal

Regional notes: Used across all of Japan. The fitness meaning is ubiquitous on Japanese fitness YouTube and Instagram.