Green’s Dictionary of Slang

pilchard-chewer n.

[the classic Cornish dish stargazy pie, in which the primary ingredient is baked pilchards]

(Aus.) an immigrant whose roots are in Cornwall.

[Aus]Bulletin (Sydney) 3 June 22/3: Billy Dolittle was a half-witted pilchard-chewer who earned a crust by ‘doin’ chars’ and the like.