My giddy aunt

I'd always believed 'my giddy aunt' to be a 'minced oath' - 'my God Almighty'. Does anyone agree, or am I wrong about this?

Here's what I've found.
"Giddy", indicating "impulsive" or "scatterbrained", is apparently derived from Old English "gydig", which meant "mad, frenzied, possessed by God".

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