Top definition
Anything that is not a cow. It is sometimes used for tags when you can't think of anything else to put in. Also, It can be used for answering a question that you don't know the answer to.
1. TAGS: Carrot, pie, elf, lichen, omelette, Not a Cow

2. Manager: "So, Alex, what have you been working on?"
Alex: " Uh.... Not a Cow?"
Manager: "You're fired."
by Lilli the Excellence June 10, 2010
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