This is a person who is your friend. This also means that this person is a close friend. This phrase can also mean that you know someone but you do not know there name. This also replaces the word "hello".

Lying flat refers to a defeatist lifestyle in Chin, where people stop working, desiring material acquisition, and tap out of any social life – sometimes for good. By lying flat, young people are participating in a kind of non-cooperation movement, rather than surrendering themselves to China's oppressive work culture where they see little hope of social mobility.

Uk definition.

Used to address someone (male)
- Whether you know them or not

Can be used be used both in positive and negative context.

Can be used as a substitute for;

'Him'

'He'
'Mate' (anything similar)

'His'

A phrase with the tonal flexibility of saying everything from "Hell yeah, bro" to "You are one smart motherfucker" (Just like Denzel Washington often says in the film American Gangster). It can be used in almost any situation that involves one's friends or enemies.

My man is my man and you can’t fucking touch him so get the fuck.You better get away from my man

people refer to their boyfriends as "my mans" if you did not know.

He is a very handsome dude, he is quite the loser but he is very loveable and you cannot live without him