Green’s Dictionary of Slang

div n.²

a weakling, a fool.

1981		J. Sullivan ‘The Russians are Coming’ Only Fools and Horses [TV script] And how are we gonna get from Peckham to the New Forest in four minutes, you old div?
1999		K. Sampson Powder 379: These divs, like, they’re not usually any kind of menace.
2007		N. ‘Razor’ Smith Raiders 246: Such a div might grass you up in a hot second.
2012		(con. 1980s) I. Welsh Skagboys 13: Some of them divs was trained in new riot tactics after Toxteth and Brixton.

In derivatives

divvy (adj.)

stupid, incompetent.

2007

N. ‘Razor’ Smith Raiders 256: Pip thought this idea was a Brahmer and congratulated his divvy pal.