mulga /ˈmʌlɡə/ noun5 •(Australia) Any of a number of small acacia trees, especially Acacia aneura, forming dense scrub in dry inland areas of Australia. •(Australia) Any region where mulga is the predominant vegetation. •[in compounds] (Australia, informal) The outback.I'd forgotten for a moment you are not all mulga-bred […] — 1901 •Ellipsis of mulga wire (“a message or story transmitted through an informal gossip network, especially one containing false information”). •Something made from the wood of a mulga tree. formsmulgas