(as) crazy as a shithouse rat
(as) crazy as a shithouse rat
rude slang Insane, senseless, or eccentric. "Shithouse" is a slang name for an outhouse. That's guy's crazy as a shithouse rat—don't listen to a word he says. You're as crazy as a shithouse rat if you believe this ridiculous scheme will work. I know some of my students think I'm crazy as a shithouse rat because of my weird methods.
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