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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."
by Concise Oxford Dictionary August 24, 2007
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