Definition - What does Purple Cow mean? Purple cow is a marketing concept developed by marketer and entrepreneur Seth Godin that states that companies must build things worth noticing right into their products or services. Godin claims that a product that isn't in itself unique and somehow remarkable - like a purple cow - is unlikely to sell, no matter how well crafted its advertising. Purple cow was Godin's addition to the traditional five P's of marketing - product, price,