The term comes from the show "Six Feet Under." During the climax of its last season, its main character is stricken by a brain embolism. As he suffers from the effects of his sudden seizure, he begins yelling the words "Numb arm," quickly slurring it into a single syllable.
Pecknarm is slang for Peckham in South London.
The nickname for Peckham is Vietnarm, due to its high crime rate and gang violence.
Pecknarm is made by mixing 'Peckham' and 'Vietnarm' together:
PECKham + vietNARM = PECKNARM .... or 'NARM for short.
Other places ending in 'ham (eg: Tottenham) are *not* Narm. Only Peckham is.
B: I'm from Narm...
A: Where's that?
A: Peckham.. South London
Nate: Numb arm... numb arm... narm! NARM!
Short for 'Vietnarm', a literal spelling of the british pronounciation of that silly old war in the 60s and 70s.
Used because parts of Dagenham represent war torn Hanoi.
"I know what you mean pal, mate Dave who lives in the narm got his benefit stopped so now he's gotta cut down on his ciggies. He's never been the same since."