Green’s Dictionary of Slang

jitter n.

also gitter
[? jitterbug n. or the movement of dancing to such bands]

1. see jitterbug n. (2)

2. (UK teen) a fan of ‘heavy metal’ music.

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OnLine Dict. of Playground Sl. 🌐 Jitter, Gitter n. Noun used to describe people who used to listen to heavy metal. Usually they wore denim or leather jackets and had lots of patches of their favourite bands.