off (one's) gourd
off (one's) gourd
slang Crazy. ("Gourd" is a slang term for one's head or mind.) After yet another sleepless night, I'm starting to feel like I'm off my gourd. He's off his gourd if he thinks this plan is going to work!
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.