老铁

Traditional form:

老鐵

Pinyin (reading):

lǎotiě

Definitions:

• (slang) very close friend; bro

Characters:

• 老 - old, aged; experienced
• 铁 - iron; strong, solid, firm

Traditional characters:

• 老 - old, aged; experienced
• 鐵 - iron; strong, solid, firm