(Australian slang) Means "the real article" genuine, not false or pretentious.
Mate, I can tell you are ridgy didge and would never try to lead me up the garden path (or lie).
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Geoff - "How would you describe an Aussie?"
Frank - "a dinky die ridgy didge true blue fair dinkum dead set wanker"
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an Australian; a person who is a citizen of Australia
Yes, I'm a dinky die ridgy didge true blue fair dinkum dead set wanker. Welcome to Australia, cobber.
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