Definitions by Concise Oxford Dictionary

Radiculas 

Urban street talk that many young dudes use around London. It's used to describe something that is both crazy and also extreme, in a hip, to-the-max kind of way.

Tommy - "Yo dude! I'm like going to totally 360 over this Austin Allegro on a baking tray!"

Billy - "Woah boi! That's totally Radiculas."

Radiculas by Concise Oxford Dictionary August 30, 2007