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I was wondering the same. After some searching, I think it's a shortened version of this: https://idioms.thefreedictionary.com/get+a+wild+hair+up+someone%27s+bu

I was wondering the same. After some searching, I think it's a shortened version of this: https://idioms.thefreedictionary.com/get+a+wild+hair+up+someone%27s+butt https://idioms.thefreedictionary.com/get+a+wild+hair+up+some...

sloaken 4y ago
That is a decent definition. Typical implication is the idea has no basis in logic or reason.
- salawat 4y ago
  This is an accurate representation of the meaning being conveyed.