a hair across (one's) ass

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a hair across (one's) ass

rude slang What one is said to have if they are intensely annoyed or irritated. Everybody who lives on this side of town has gotten a hair across their ass ever since the construction of the new tramline has caused such terrible traffic jams. After experiencing so much turbulence on her flight, Liz really had a hair across her ass by the time she landed. Now, don't get a hair across your ass—I'm just ensuring we are following the letter of the law every step of the way.