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A derwent derwen is a colloquial term for a person who is or acts stupid or retarded. It refers to a large estate (The Derwent) where people with learning disabilities live and run a garden shop. It is a term which comes traditionally from North Shropshire but is begining to recieve more mainstream usage.
"Dont be such a derwent"
"Stop acting like you live at the derwent"
"Your such a derwent-face"
by jeff834 January 16, 2009