An oreo with one of sides turned backwards. This generally results in the design on top of the cookie getting stamped into the creme filling on that side.

Having both of the sides turned inwards is called a magical mystery backwards oreo.
John: *takes an oreo from the package* Hey! I got a mystery backwards oreo! I wonder how these happen...
by Nommy McNomNom September 1, 2009
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An oreo cookie with both cookie parts turned inward. Frequently results in the creme being stamped with a reverse image of the cookie design on both sides.

One side being turned inwards is called the mystery backwards oreo.
Bill: *is eating oreos* Oh man! I got a magical mystery backwards oreo!

John: Aw. I only got a mystery backwards oreo.
by Lump sum September 2, 2009
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