Top Definition
A cow who is a ninja and stands on motherfuckers who try to mess with him. A cow ninja is also a fast cow who knows how to handle his weapons and use his speed to propell him/herself onto walls, basically running on walls.
"Omg look a cow ninja!" says the kid
"moo" shink!!
the cow says "another head gone, moo"
by Yoer October 27, 2007
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