One of the books I'm currently reading is the Booker Prizewinning 'English passengers' by Matthew Kneale. Here's a fascinating passage of Manx invective (page 32):

"We called Gawne some names that morning, I can tell you. Scrissag. Scrawl. Sleetchy old scraper. Hibernator. Castletown snot. Fat muck of a fritlag. Big slug, all sitting on his shillings with his little crab of a wife, snurly and high as if they thought they were somebody."

There's a whole heap more in the Glossary as well.