Is za an acceptable Scrabble word meaning pizza and if so in what references has it been authenticated?

There are many unusual words in the official scrabble list of acceptable words, and za as an abbreviation for pizza has recently been added to the British Scrabble Club Word List (CWL)
(and plural: zas!)

However, in order enable immediate verification of words whilst playing, opponents should agree before play on what dictionary they will use as final authority, one that they all have access to should a dispute arise. The paperback 'Official Scrabble Words' is a very useful book to have at hand, and it also gives some tips on play and letter combinations.

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