wild hair

Sudden decision that is not expected.

Grisham said the judge from N.Y. got a wild hair and set up his own outfit in Memphis
After our marriage, my wife got a wild hair and got involved with the Nudist Movement

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Wild hair up his ass

An action of a sudden & unexpected nature. Something done by a person that is uncharacteristic for that person to do.

"Sam out of nowhere got a wild hair up his ass & moved to Dubai to study Scandinavian Moose!

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a wild hair up my butt

A sarcastic way of saying/admitting that you made a mistake, or did something stupid/ irresponsible.

Homeowner: "I didn't ask for that! I'm not paying for it!"
Carpenter: "I'm sorry mam, i thought it would be a nice touch. Guess I had a wild hair up my butt on that!"

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Wild Hair

A Boomer expression meaning random urge to do something immediately

"I don't know why Gretchen ate that whole bottle of Sriracha, must've been a wild hair,"
"Who is Gretchen grandpa? Also put your pants on!"