Green’s Dictionary of Slang

1. (Aus./N.Z.) the anus.

1966		Trimble 5000 Adult Sex Words and Phrases.
1972		B. Rodgers Queens’ Vernacular 19: the rectal opening, anus [...] gonga (obs, cf Sp ganga = a kind of prairie hen with the incubating rump of a brooding hen).
1988		McGill Dict. of Kiwi Sl. 53/2: gunga [...] anus, in phrs. ‘up your gunga’ or ‘stick it up your gunga’.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].

2. (US campus) an unattractive woman.

1967–8

Baker et al. CUSS.

3. (Aus./N.Z.) the vagina.

1988		McGill Dict. of Kiwi Sl. 53/2: gunga vagina.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].