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1.
A term used by someone to refer to themselves as a fan of Benedict Cumberbatch. To be a "Cumbercookie" is to be a part of the "Cumberbatch".
Girl 1: "I LOVE Benedict Cumberbatch!"

Girl 2: "Me too!"

Girl 3: "Those two are such Cumbercookies.."
by YBK August 22, 2013