The one word answered used as an alternative to 'I don't know' usually spoken with a scooby doo voice and the shrug of the shoulders/absolute stupidity/lack of speech
Dad: "What's that noise?"
Trevor: "Radunno"

Dad: "Where are my car keys?"
Trevor: "Radunno"

Dad: "What did you say?"
Trevor: "RA. DUN. NO!"
by ogdenmaaaa July 17, 2011

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