be (as) mad as a hatter

1. To be crazy. Tim has been behaving very erratically lately, so I'm afraid that he's as mad as a hatter.

2. To be very angry. Mom was mad as a hatter after I dented her brand-new car.

Name	Pronounced	Usage
SÉ	SHAY	Irish
Adlington	['ædliŋtən]
Apurva	-	Indian, Hindi, Marathi
Cleitus	-	Ancient Greek (Latinized)
Alva (2)	AL-və	English
Zion	ZIE-ahn (English)	Jewish, Biblical