Green’s Dictionary of Slang

1. (US) a late-night work shift.

1977

J. Sayles Union Dues (1978) 64: Won’t be long now, Hunt, they got him workin a ten-to-six cat-eye over there. Damn people won’t even run a regular shift.

2. (N.Z. prison, also catwalker) an over-inquisitive prison officer.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 39/1: cat eye n. a wary, watchful, over­ inquisitive prison officer: ‘Watch out, there’s a cat eye over there [...] catwalker n. = cat eye.