Green’s Dictionary of Slang

snitcher n.1

[? snitch n.1 (1), i.e. their devotion to tweaking or punching people on the nose]

a member of a set of fashionable young men or ‘bloods’.

[UK]Annual Register II 51/1: He was a respectable member of the Killers of Care, — the Silenians [...] the Bucks, Bloods, Snitchers, Choice Spirits .