from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A cant used by the homosexual community in Britain, in the London fishmarkets, and in the theatre, attested since at least the 19th century and popularised in the 1950s and 1960s by the camp characters Julian and Sandy in the popular BBC radio show Round the Horne.
- proper n. A cant used by the Romani people in the theatre, fairgrounds, and circuses of Britain.
From Italian parlare ("to talk"). The loss of the first r and the changing vowel quality of the non-stressed vowels is due to the non-rhotic UK accent which reinterpreted the phonemes. The adoption of the infinitive form means that the word probably came via a Romance-based creole or pidgin like Lingua Franca, which use the infinitive of source words to fill every grammatical purpose of the pidginised verb. (Wiktionary)