Green’s Dictionary of Slang

bacchus marsh n.

[Bacchus Marsh, a town half-way between Melbourne and Ballarat]

(Aus.) a semi-erect penis.

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[UK]Roger’s Profanisaurus 3 in Viz 98 Oct. 3: Baccus Marshn. A dobber From the spongy area halfway between Ballerat and Melbourne (qv).