Definition
An affectionate nickname for a Boston Terrier puppy with perfect black-and-white coloring that makes them look like a tiny, adorable cow.
Example Usage
Their new Boston Terrier is such a Beanie Moo with those spots—she's impossibly cute.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Beanie%20Moo&defid=1215503)
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