マブダチ

noun

true friend; close friend

Slang term from youth culture, especially associated with the ヤンキー subculture. Dated, now mostly used nostalgically or in period pieces. Often implies a very tight, almost family-like bond.

• あいつは俺おれのマブダチだ。

  That guy is my true friend.

• 高こう校こうのときのマブダチと久ひさしぶりに会あった。

  I met up with my close friend from high school for the first time in a while.