off one's rocker

Also, off one's nut or trolley . See off one's head.

Name	Pronounced	Usage
Wincenty	veen-TSEN-ti	Polish
Dewitt	[də'wit]
Basil (1)	BAZ-əl	English
Onesimos	-	Ancient Greek, Biblical Greek
Fahd	-	Arabic
Petruccio	-	Medieval Italian