Green’s Dictionary of Slang

rotary (ho)! excl.

also rotary hoe!

[rhy. sl. righteo! excl. + pun on SE rotary hoe]

(Aus./N.Z.) fine! OK!

1999		G. Seal Lingo 91: rotary hoe means rightio (a term of agreement).
2003		McGill Reed Dict. of N.Z. Sl.