Definition of "mandem"

The mandem all used to go round there and get head off her, the sister blowing the man line by line while her brother shotted downstairs in the stairwell.

2011, “Chyna”, in How I Escaped a Girl Gang: Rolling in a London Girl Gang

She probably heard some hyped up version from the mandem but she don't know the truth. She ain't seen what I seen.

2013, Polly Courtney, Feral Youth, page 169

[…] reports suggest he may have had links to that group and allied north London gangs such as the Broadwater Farm Posse and Tottenham Mandem.

2013, David Childs, Britain since 1945: A Political History

But you see my man over there with the pouchDare one of you man try get loudAll of my mandem move so foul

2015, “Shut Up”, performed by Stormzy

The mandem too inconsiderate, five-star hotel, smokin' cigarette / Mixin' codeine up with the Phenergan

2023, “Sprinter”, performed by Central Cee x Dave