Sweet As

One of the fridge magnets on Wendy and Martin's fridge is of one of the most-heard sayings in New Zealand.  It's not really regarded as slang but as a generally understood expression broadly used to describe something highly regarded “This concert is going to be sweet as!”  Pronounced sweet aas.  But sweet as what?  We shall never know.  

Sweet can also be used on its own to indicate general agreement, “I can meet you after work if you like,” “Sweet!”