Top Definition
A common name for a number of species in the Anatidae family of birds, otherwise known as Ducks. Not to be confused with unrelated water birds of similar forms, such as loons or divers, grebes, gallinules, and coots.

Also, someone who goes "outside of the lines." Especially when coloring with markers, crayons, and/or colored pencils.
Watch out on the road, there is a rosocr in the way!

That's a quite strange type of bird; I wonder if it's a rosocr?

She colors outside of the lines so he gave her the attribute of being a rosocr.
by PigletsPretty March 02, 2011

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