Green’s Dictionary of Slang

(Aus.) anything or anyone second-rate, fake or otherwise worthless.

1964		B. Hesling Dinkumization or Depommification 219: Even if he had been a real bodge he still would have known he could paint.
1999		(ref. to WWII) G. Seal Lingo 66: One negative lingoism of the World War II that is worth a little more attention is bodger meaning something or someone thought to be of inferior quality or someone who makes a mess of things. The term derives, it seems from a British dialect word related to ‘botch’, a mainstream term for doing a job badly.
2001		N. Barlay Hooky Gear 57: All them geezers, builders, penny-a-dozen subcontractors, plumbers, roofers, Situsec crews, chippies, lekkies, humpers, glaziers, cowboys, bodgers an odd-jobbers buildin an repairin whole towns.