A group of boys who enjoy daily meetups to partake in sexual activities, used in UK slang regularly.
Are we meeting with mandem tonight? I bought a condom!
A group of road men a mandem is a bunch of chavs
Oy me and the mandem just robbed that shop
A group of immatures on xbox with fidget spinners and sully pillow pets. Also mickey mouse hands with blood on and a papa smurf fetish.
Yo, wagwan pifting. Wanna be part of the quack mandem ennit.