Green’s Dictionary of Slang

1. (W.I./UK black) a ghetto weapon, e.g. a gun, a ratchet-knife.

2003		Dizzee Rascal ‘Cut Em Off’ 🎵 Now we settle disagreements with a skeng.
2013		K.Koke ‘Are You Alone Fam’ 🎵 It's click clack when I see you with skengz / You get napped if we see you in ends.
2015		thewire.co.uk Oct. 🌐 There are many terms for guns [in grime music], for instance, usually single syllable words that can be dropped quickly: heat, skeng, shotty, pumpy, glock, gat, and so on.
2018		Unknown T ‘Homerton B’ 🎵 Look, it's mental up in my ends / Got packs on crack, nutshells and skengs.
2022		Digga D. ‘What You Reckon’ 🎵 Top ten with the skeng, I’ll blast him (Mm) / Top five with a knife, I’ll carve him.

2. (UK Black) in fig. use, talent as a creator of rap lyrics.

2016

Times 20 Aug. 🌐 The word ‘skeng’ is a slang term derived from Jamaican patois for knife. [...] The term ‘skengman’ orgininaly might have alluded to knives [but] it is now becoming more like an abstract term for being a tough, winning every battle. Stormzy said [...] he understood skeng toi mean ‘lyrically talented’.

3. (UK drugs) cocaine in powder form.

2017

1011 ‘No Hook’ 🎵 Any skeng on sale man cop it / Drop it, whip it and rock it.