(I'll be) hanged if I know!

I have absolutely no idea! A: "How are you supposed to turn on this newfangled computer?" B: "Hanged if I know!" I'll be hanged if I know how to fill out these tax forms!

Common Names:

Name	Pronounced	Usage
Mimi	-	English, Italian
Alston	['ɔ:lstən]
Cadi	-	Welsh
Tabatha	TAB-a-thə	English
Gwillym	-	Welsh
Manoel	-	Portuguese (Brazilian)