Green’s Dictionary of Slang

(W.I./UK black teen) a group of people who stick together and have shared social interests, such as a dancehall crowd; often specified by a geographical name, e.g. the Peckham massive, the Tottenham massive.

1991		Tony Rebel ‘Sweet Jamaica’ 🎵 Sweet Jamaica [...] Me know the whole massive love it.
1992		V. Headley Yardie 83: Dis one goes to all the yardman massives.
1994		M. Montague Dread Culture 177: Bigup all masses and crew from Soul Connection. Jane and Finch masses hold tight. Scarborough posse, yuh LARGE. Bigup di one and only Rankin in di dance.
2000		Guardian Guide 1–6 Jan. 18: Word to the Little Mimsies massive, I’m mutha-hubbard outta here!
2009		T. Black Gutted 172: That was the most pathetic put-up I’ve ever seen [...] running with the Sighthill massive and that’s the best you can do?