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A mixture of fuck and dammit used as a harsh and abrupt way to describe sever frustration via text or online chat. Can be capitalised for extra emphasis.
Kane: "Oh so we need an example for urban dictinoary."
Sara: "I can't think of anything"
Kane: "Me either"
Sara: "fkdmt"
Kane: "fkdmt"
by lessthanthreedashdashdee August 13, 2010