We have learned the word "闺蜜" (guī mì), which describes a close friend, mostly referring to the close relationship between women. How about the close relationship between males?
"铁哥们儿" (tiě gē menr) literally means that the relationship between male friends is as hard as iron. You can understand it as "bro", "buddy", "sworn friend", "pal" and all that.
yuē sè fū hú kè shì dá ěr wén de tiě gē menr, yí gè yǒng gǎn wú wèi de zhí wù xué jiā hé tàn xiǎn jiā.
Darwin's great buddy was Joseph Hooker, the intrepid botanist and explorer.
tīng zhe, gē menr, nǐ de zhōng gào wǒ tīng gòu le!
Listen, pal, I've had just about enough of your advice.
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