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A common phrase used to describe a brunette, rather than a blonde, with low intelligence, practical experience, or common sense. It compares her intelligence to that of roadkill.
Wow, Jane just got a -14 on her math test... She's such a dumb deer.

Kandel is such a dumb deer! She keeps complaining that her pencil is backwards and that the eraser is where the point should be and the point is where the eraser should be!
by Endoplasmc Reti February 05, 2010
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