Green’s Dictionary of Slang

1. in pl., an animal’s innards.

1941

Baker Popular Dict. Aus. Sl.

2. a schoolteacher [basic maths, e.g. ‘how many times does two go into four?].

[1910		Worker (Wagga) 16 Mar. 3/5: Johnnie; ‘We’re studying' guzinter, now.’ ? L[ady] V [isitor]: ‘Guzinter, guzinter? Why, what’s that, Johnnie?’ J.: ‘Aw, don’t you know? Don't you know about 4 guzinter 8 two times, and 2 guzinter 4, uh?’].
1945		Baker Aus. Lang.
1951		D. Stivens Jimmy Brockett 52: I wanted to ask the old guzinter where all his bright boys were today.