Ka pai means: A Maori phrase meaning good, fine, or well done - used in New Zealand English as an expression of approval or encouragement. 'Ka pai' is one of the most commonly borrowed Maori phrases in New. It is mainly New Zealand English and may not be understood outside that context. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. As a place or proper-name reference it is purely descriptive.