Green’s Dictionary of Slang

neek n.

[nerd n. + geek n.1 ]

1. (UK teen) an insult, used of a male .

Grizzy ‘Mandem Salute’ 🎵 I never really told these neeks about the trap, trap, trap, trap).
[UK]Independent 5 Jan. 🌐 There are insults and terms of disapproval such as wasteman, gasman, neek (both nerd and geek), dinter and bell for males.
[UK]G. Krauze What They Was 227: Tyrell went and handed himself in to the feds [...] What a neek.

2. (UK teen) a drug dealer.

[UK]Eve. Standard 4 July 8/4: Their graphic vocabulary — skengs (guns), borras (knives), nittys (drug addicts), neeks (drug dealers).
Harlem Spartans ‘Money & Beef’ 🎵 Them boy some neeks / They say they trap (uh, uh) not like my team.

In derivatives

neeky (adj.)

(UK black) weak; insignificant, second-rate.

Section Boyz ‘Trapping Ain’t Dead’ 🎵 Don’t give a fuck, them guys are neeky.
[UK]G. Krauze What They Was 156: Put down knives save lives and whatever neeky message they have to say.