マブダチ

• Reading: マブダチ
• Romaji: mabudachi
• Pronunciation: /ma.bu.da.tɕi/

Meaning

A true, real best friend — slang for someone who is genuinely your closest, most trusted friend.

マブダチ is a slangy, emphatic way to say 'best friend' that feels stronger and more street-smart than 親友. It combines マブ (real/genuine, from underworld slang) with ダチ (friend, a rough/casual abbreviation of 友達). It was especially popular among Japanese youth and delinquent subculture but has broadened into general casual usage.

Examples

1. あいつとは中学からのマブダチだから、何でも言い合える。 That guy and I have been real best friends since middle school — we can say anything to each other.
2. マブダチがいないと人生つまらないよ。 Life would be boring without a true best friend.
3. 困ったときに助けてくれるのが本当のマブダチだよね。 A real best friend is someone who shows up when you're in trouble.

Usage Guide

Context: friends, youth culture

Tone: rough, heartfelt

Do Say

• お前は俺のマブダチだ。 (You're my true best friend.)
• マブダチに裏切られるのが一番きつい。 (Being betrayed by your true best friend hurts the most.)

Don't Say

• フォーマルな場で「マブダチ」は場違い (Using マブダチ in formal settings sounds too rough and out of place — use 親友 instead)

Common Mistakes

• Using マブダチ in polite or formal conversation — it's rough slang that sounds out of place outside casual settings

Origin & History

From マブ (real/genuine, originally underworld/yakuza slang meaning 'true') + ダチ (casual abbreviation of 友達, friend). Popularized through youth and delinquent culture, especially in the 1980s-90s.

Cultural Context

Era: 1980s-90s youth/delinquent culture, still known today

Generation: Known by most ages, though slightly dated for younger speakers

Social background: Originally street/delinquent culture, now broader casual

Regional notes: Used across all of Japan. Has a slightly retro feel but is still understood and used.