(N.Z.) good at, expert in.
|N.Z. Sl. 56: To be pie at (or on), to be expert or efficient at something, is another phrase of wide use in this country. It has been drived from the Maori pai, good.|
|Dict. of Kiwi Sl. 83/2: pie good, pie on expert or efficient, good at, from Maori ‘pai’, good, ‘pai ana’, suitable; eg ‘That paint job was pie on, ta muchly.’.|
|Reed Dict. of N.Z. Sl. [as cit. 1988].|