Green’s Dictionary of Slang

whawha v.

(N.Z. gay) for a client to grope a male prostitute.

[NZ]W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 73: by the 1980s [Maori hybrids] had been joined by expressions like getting whawha’ed (being groped by a client).