Green’s Dictionary of Slang

(UK black) Peckham, south London, known for its violent housing estates.

2009		Urban Dict. 25 May 🌐 Pecknarm is slang for Peckham in South London.
2020		G. Krauze What They Was 110: It’s going on in other blocks, in other ends like Pecknarm and Bricky and Hackney.