Green’s Dictionary of Slang

cannie n.

[abbr.]

1. a cannibal.

[UK]Whizzbang Comics 9: I was smoking a fag when I spotted the cannies.

2. (Scot.) a canteen, usu. institutional.

[Scot]I. Welsh Filth 45: We [...] head down the cannie with Gus for a shorter than usual lunch.