Green’s Dictionary of Slang

pork pie n.

[rhy. sl.]

1. (Aus.) an eye.

[Aus]Argus (Melbourne) 13 June 4s/4: Pork pies for eyes.

2. (N.Z. prison) a lookout, a spy.

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 143/2: pork pie a lookout .