Green’s Dictionary of Slang

proddyhopper n.

[Proddy n.]

(N.Z.) a derog. term (mainly juv.) for a Protestant.

[Aus]R. Park Harp In The South 12: Promptly Dolour yelled back: ‘Garn, yer old proddy-hopper!’.
[UK]F. Keinzly Tangahano 165: ‘It was the proddyhopper, Sister—’ ‘What is a proddyhopper, Augustine?’ ‘A protestant kid.’.
W.J. McCarthy Listen...! 21: It was only natural that we ‘Cattledogs’ [from Marist Brothers School, Tasman Street, c. 1916] were frequently ambushed by those ‘Proddyhoppers’ [from Mount Cook State School] [DNZE].
[Aus]R. Park Fence around the Cuckoo 94: We children had a kind of good humoured rivalry, admittedly, often shouting, ‘Yah yah, Cattledog!’ or ‘Proddyhopper!’ as the case might be.
[NZ] McGill Reed Dict. of N.Z. Sl.