The following are results from an OZ-words Competition where entrants were asked to take an Australian word, alter it by one letter only, and supply a witty definition.

Clearly, you need to be an Aussie to understand.

Billabonk: to make passionate love beside a waterhole

Bludgie: a partner who doesn't work, but is kept as a pet

Dodgeridoo: a fake indigenous artefact

Fair drinkum: good-quality Aussie wine

Flatypus: a cat that has been run over by a vehicle

Mateshit: all your flat mate's belongings, lying strewn around the floor 

Shagman: an unemployed male, roaming the Australian bush in search of

               sexual activity 

Yabble: the unintelligible language of Australian freshwater crustaceans 

Bushwanker: a pretentious drongo, who reckons he's above average when

                   it comes to handling himself in the scrub

Crackie-daks: 'hipster' tracksuit pants.  And for the Kiwi's amongst us: 

Shornbag: a particularly attractive naked sheep.

sathorn...not very well I'd reckon - you need to read the rules again mate...

"The following are results from an OZ-words Competition where entrants were asked to take an Australian word, alter it by one letter only, and supply a witty definition."

...but a couple of yours are funny despite not conforming to the aforesaid rules.

Have to agree with grezzzy_greer but you are going down the right track.