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
Keinan	-	Biblical Hebrew
Belenus	-	Celtic Mythology
Huguette	-	French
Benignus	-	Late Roman
Nerys	-	Welsh
Kornel	KAWR-nel (Polish)	Polish, Czech, Slovak