Top Definition
a member of any number of species of grebes (a small, duck-like wild bird), most of which are only distinguishable at a distance from a duck due to their comparatively recessive hindquarters.
"I thought that was a duck sitting on the pond, but it didn't have much of an ass on it; it musta been an assless curlybird."
by Brodsgaard November 23, 2003
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