Green’s Dictionary of Slang

broggy n.

[mis-reading of brodie n.1 (5)]

(Aus.) a skid mark on the road; thus do a broggy v., to skid and produce a mark.

[Aus]Ozwords Apr. 3: Do you know the phrase doing a broggy? It means producing a skid mark on a dirt road when riding a bicycle, broggy being the mark produced.