Polari.

• Language variation dependent on sexuality.
• It's an anti-language.
• Mainly used by homosexuals.
• Originated when homosexuality was illegal.
• Mainly used in London.
• Paul Baker estimates that there are 500 words in the Polari language.
• Polari is largely used by the traveller community and The circus.
• Also known as 'Palare'.
• Mainly used by gay men and the theatre community.
• Used on 'Round the Horne' radio show.
• Form of protection / secrecy. 
• Excluded outsiders.
  
  Examples:
• Bevvy.
• Bitch.
• Camp.
• Batts (shoes.)
• Chicken (young).
• Ecaf (anagram of face).