Green’s Dictionary of Slang

sheepo n.

also sheep-ho, sheep-oh
[SE sheep + -o sfx (3)]

1. [late 19C–1900s] (Aus./N.Z.) a sheep-shearer, spec. one who works in the catching sheds, filling the catching pens.

2. [1980s] (N.Z.) a shepherd, a musterer of sheep into pens.