get a wild hair up (one's) butt(redirected from gotten a wild hair up their butt)
get a wild hair up (one's) butt
1. rude slang To become intensely annoyed or irritated. Everybody who lives on this side of town gets a wild hair up their butt about the traffic delays from construction of the new inter-city tramline.
2. rude slang To become obsessed (with someone or something), often when said obsession is strange or unexpected. I don't know why Mom's got a wild hair up her but about going to Paris all of a sudden. She doesn't know the first thing about France!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.