Green’s Dictionary of Slang

(Aus.) the head, the brain.

1908

Bulletin (Sydney) 13 Aug. 15/2: Fags, upon his release, grasped the milking-stool, and most ungratefully smote the Pagan upon the brow. ‘That’s one f’r y’r guessin’ gear, y’r curry-faced squib,’ he hissed. ‘I’ll teach y’r t’ shove th’ ruddy ruminator on top uv me, y’r stale-fat fakir.’.