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Phrase(s): have a corncob up one’s ass [and] have a poker up one’s ass
1. Inf. to be very stiff. (Use with caution.) • How come you’re acting so high-and-mighty with me? Do you have a corncob up your ass? • He was a terrible actor, stiff and wooden. He looked like he had a poker up his ass. 2. Inf. to be very touchy or irritable. • Wow! Old Mr. Webster really has a corncob up his ass this morning. Watch out! • Tom has a poker up his ass and he’s looking for you. Better make yourself scarce.
McGrawhill's American Idioms And Phrasal Verbs