doolally

slang Insane. The phrase originated as military slang referring to "Deolali," an Indian town where a military sanatorium was located. They'll lock you up if you go doolally on us. I don't know what that guy's blathering about—I think he's a bit doolally. You'd go doolally too if you'd seen the horrific things he's seen in battle.

go doolally

slang To become insane. The phrase originated as military slang referring to "Deolali," an Indian town where a military sanatorium was located. They'll lock you up if you go doolally on us. I don't know what that guy's blathering about—I think he's gone doolally. You'd go doolally too if you'd seen the horrific things he's seen in battle.