have a wild hair up one’s ass

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have a wild hair up (one's) ass

1. rude slang To be intensely annoyed or irritated. Everybody who lives on this side of town has a wild hair up their ass, thanks to the traffic delays from construction of the new inter-city tramline. After experiencing so much turbulence on her flight, Liz really had a wild hair up her ass when she arrived in town.
2. rude slang To become obsessed (with someone or something), often when said obsession is strange or unexpected. I don't know why Mom has a wild hair up her ass about going to Paris all of a sudden. She doesn't know the first thing about France!
See also: ass, hair, have, up, wild
Farlex Dictionary of Idioms.

have a wild hair up one’s ass

1. tv. to act in a hyperactive and energetic manner. (Usually objectionable.) She has a wild hair up her ass about something. I don’t know what.
2. tv. to be obsessed with some strange or offbeat idea. (Usually objectionable.) You’re acting like you’ve got a wild hair up your ass. Calm down.
See also: ass, hair, have, up, wild
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • asses
  • sling