Meaning
The guys — one's crew, one's group of male friends and associates, taken together as a tight unit. Built from 'man' plus the plural marker 'dem', it literally means 'the men', but as a collective it names the bond of a close circle: 'di mandem' are your people, your bredrin, the ones you move with. Now spread far into British and diaspora speech, it carries a strong sense of belonging, loyalty, and running together as one.
Examples
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Mi an di mandem a link up later.
The crew and I are meeting up later.
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Di whole mandem deh a di corner.
The whole crew is at the corner.
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Big up di mandem.
Respect to the crew.
Origin
From 'man' plus 'dem' (the Jamaican plural marker) — literally 'the men'; hugely popular in Jamaican and British-Jamaican speech.
How it’s used
Means the crew as a collective. Widely adopted into UK street slang through the Jamaican diaspora.