Brown cow is American slang for a root beer float — vanilla ice cream scooped into root beer. The name plays on the colour combination (dark brown root beer, white ice cream) and the dairy connection of the ice cream. It's a nostalgic, diner-counter term, the kind of thing you'd order at a soda fountain. The register is cheerful and retro American. Regional in usage, with the term more common in the Midwest and Northeast than elsewhere.
She ordered a brown cow at the soda counter and sat spinning on the stool while it was made.
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(slang) A root beer float.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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