Green’s Dictionary of Slang

huckleberry finn n.

(Aus.) gin.

1905		Duke Tritton’s Letter n.p.: I can go into the Rubbity Dub and have a lemonade, breasting the Near And Far with booze hounds drinking Tom Thumb, Young And Frisky, Oh My Dear, or Huckleberry Finn.
2002		Pete’s Aussie Sl. Home Page 🌐 Huckleberry Finn: gin.