Ian McDonald's Everness series has main characters speaking in Polari, and where I first encountered it as a thing. And the books, even though they're aimed at young adults are really good.
What surprised me is how many words I use regualrly had their origins in Polari. I don't know whether it's because they've made their way into mainstream language, or just a regional thing though.
There is a similar phenomenon in American English where a huge, huge number of words in the dominant dialects come directly from AAVE (Afro-American Vernacular English). I would not be surprised if many of those words have spread all throughout the anglophonic world.
What surprised me is how many words I use regualrly had their origins in Polari. I don't know whether it's because they've made their way into mainstream language, or just a regional thing though.