From the Latin 'Mandemulus', meaning a collection of less than reputable characters.

A man who messes around with other men, but no one would ever know by looking or talking to him. Used by gay black men to identify masculine gay men or DL Brothas.

Man Dem is the term used for a group of friends or homies. This term originated from the carribean but found its way to the streets of the uk where it is widely used.

simply put, an alternative way of saying friend

Mandem like a plural of man.
a group of boys.

Definition is Jamaican/Patois slang meaning - "them men over there" literally, but is used to describe the men in society, can be used for random people/friends - mostly used for friends/acquaintances these days in London.

A hoard of pikeys who go around doing chavvy behaviour. Typically proletariat these underlings try to terrorise the streets of cities with ASBOesque behaviour. Often being very 'try hard'.