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When someone is caught lying. How now is self explainitory. Brown Cow means that they are a liar. Works incredibly well if they are exposed for their lie.
Guy 1: Hey, I know what the capital of Illinois is. It's Chicago.

Guy 2: It's Springfield. How now brown cow?
by gbee93 March 23, 2011
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3
Guy's slang for a hott girl.
Dude did you just see that how now brown cow?

There is a how now brown cow walking this way.
by Tepeki August 13, 2007
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