"What's the good oil on the new manager?"
Where "Good Oil" Comes From
"The good oil" is believed to come from Australian mining and oil-exploration slang, where "the oil" referred to genuine, valuable information about a strike or a job — much like literally "striking oil."
By extension, "the good oil" broadened out from the mining world into everyday conversation, coming to mean trustworthy, valuable information on any topic.
How Aussies Actually Use It
You'll hear "good oil" most in workplace or social settings, when someone wants the real, reliable version of events rather than rumour or guesswork.
It pairs naturally with "what's" or "give me" — "what's the good oil" and "give me the good oil" are both extremely common ways to ask for it.
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