People that are a part of your so called 'gang'.
It is often used in the UK particularly London.
Kid: Yo, you tryna fight my mandem?
Kid 2: No I'm sorry. :(
Not an English/ British term, more of a mongol slang for a mate.
Bled, check out mandem they is rizzin dat bare pissy right dere.
Alternative:
Hello Timothy, do you see that fellow over there by the park bench? He seems to be chatting up my sister in law Barbara.
A group of roadmen who are about to slap some corn on u
Ay u best kno not to link the mandem batty gyal
A group of friends or a friend. The people in this group are Roadmen.
Gonna get a cheeky Nandos with the Mandem.
The london word for the men dem
During Sex
Man(non londoni)- Aaah
Londoni Woman- Wagwan Big up the mandem im having sex with