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The product of mixing the word 'terrible' and 'brilliant'. Something that is absolutely awful, but has a certain quality that makes it great, or is just so bad it's good. Usually associated with things with cult followings.

Initially invented in Northern England, rose to popular usage after being featured on sitcom 'Peep Show'.
"Did you see that new Adam Sandler movie? It was terribrill."
by FamousPeter January 19, 2012