マイメン

noun

bro; buddy; close friend

Slang term of endearment or address for a close male friend, similar to 'bro' or 'my man'. Can also be used for a respected person or beloved family member, but primarily a casual male-to-male term.

from English my man

• おい、マイメン、元げん気きか？

  Hey, bro, how's it going?

• あいつは俺おれのマイメンだから、何なんでも話はなせる。

  He's my close friend, so I can talk to him about anything.