>>>But this is the usage of "what" to mean quality, not identity or definition. "what am I again?" - "you're mad". I brought this up because last time we discussed this someone (you, Alan or someone else) pointed out that that usage is simply not in use, or something to that effect. So, my question is - does this usage of "what" fall under regular ones, or is it just... the workaround for the lack of word which would mean "kakav"?
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>>It was I. And I stand by what I said. Finding one case where it is used after all this time qualifies as it not really being in use.
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>OK... I'll report back when I get ten more.

You don't need to. Here, in the U.S. 'what' is used as in your example. Obviously it is another example of how we Americans have corrupted the English language :o)