Green’s Dictionary of Slang

punga n.

(N.Z.) the penis.

1988		McGill Dict. of Kiwi Sl. 88/2: punga penis, by association with the tree fern, Maori ‘ponga’.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].

In phrases

how’s your punga?

(N.Z.) a phr. of greeting.

1988		(ref. to 1960s) McGill Dict. of Kiwi Sl. 88/2: how’s your punga? a male student 1960s salutation.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].