Why do guys call each other “man”? [closed]

Just curious. Why do a lot of guys call each other “man”? What’s the origin of that term? EXAMPLE: “Hey, man. What’s up?”


Solution 1:

Man:

as a word of familiar address, originally often implying impatience, c. 1400; hence probably its use as an interjection if surprise or emphasis, since Middle English but especially popular from early 20 c.

(Etymonline)