be out of (one's) tree

slang To be crazy. After yet another sleepless night, I'm starting to feel like I'm out of my tree. He's out of his tree if he thinks this plan is going to work!

Common Names:

Name	Pronounced	Usage
Feidhelm	-	Irish
Nikifor	-	Russian, Bulgarian, Macedonian
Forbes	-	Scottish
Tarasios	-	Late Greek
Petru	-	Romanian, Corsican, Old Church Slavic
Odoacer	o-do-AY-sər (English)	Ancient Germanic