1
general::
Phrase(s): have one’s ass in a sling [and] have got one’s ass in a sling
Sl. to be dejected or hurt; to be pouting. (Potentially offensive. Use only with discretion.) • She’s got her ass in a sling because she got stood up. • So you didn’t get a perfect score. Why do you have your ass in a sling?
McGrawhill's American Idioms And Phrasal Verbs