铁哥们

鐵哥們
tiěgēmen
(coll.) very close male friends

CEDICT

colloquial

Entry Composition

1 铁 tiě
  1. iron (metal)
  2. arms
  3. weapons
  4. hard
  5. strong
  6. violent
  7. unshakeable
  8. determined
  9. close
  10. tight (slang)
2 哥们 gēmen
  1. Brothers!
  2. brethren
  3. dude (colloquial)
  4. brother (diminutive form of address between males)