off one’s chump

mod. crazy; nuts. Am I off my chump, or did that car suddenly disappear?

Name	Pronounced	Usage
Cory	['kɔri]
DeasÚN	-	Irish
Evangelina	ə-VAN-jə-lee-nə (English)	Spanish, English
ŽAn	-	Slovene
Moira	['mɔirə]
Auberon	O-bər-ahn	English (Rare)