noun: (Australia) Any of a number of small acacia trees, especially Acacia aneura, forming dense scrub in dry inland areas of Australia.
noun: (Australia, colloquial, in combination) The outback.
noun: Something made from the wood of a mulga tree.
noun: Short for mulga wire (“a message or story transmitted through an informal gossip network, especially one containing false information”). [An informal gossip network, especially in a rural area such as the outback; also, a component in the network (either a person or an imagined wire).]