0 a form of slang used by some groups of people in Britain, especially by gay people and especially in the past: --
"Bona!" as they say in Polari.
The characters spoke in Polari, a bizarre mixture of the Romany language and homosexual streetcode.
Retaining its roots in showmanship, secrecy and dodgy dealings, Polari evolved into a vehicle for campery, bitchiness, filthy jokes and innuendo.
Polari was adopted by the British gay community and its use was rife in Soho's gay clubs and bars in the 1950s.