Bristolian slang for "Thank You Very Much".
With the famous pronounciation of the Bristolian 'L' (awl) at the end, this means more than simply Chiz.
An abbreviated version of "Cheers muchly".
English: You bought me a Vauxhall Nova for Christmas? Thank you very much, Mum!
Bristolian: You gots me dat Novawl for Crissmas? Chizawl ar Muh!