It actually means, "What's next?" I read that on the Merriam Webster Dictionary site after trying to look it up here.
"How now, brown cow?"

"You're going to turn into a purple cow."

*poof*
by Sara Harmon February 22, 2006
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lighthearted way of asking "What's up? What's next?"

Has its roots in prohition era referring to when a keg (brown in those days) was empty, "well, what are we gonna do now..."
"It seems as though the rave is over, Winnifred" says Penelope.
"How now, brown cow?" says Winnfred inquisitively
"Let's get poprox!"
by TexasCaveman July 31, 2005
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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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brown chicka brown cow; (brown-chicka-brown-cow) similar to the sound bow chicka wow wow
The combination of a brown chicken and a brown cow.

When put together you get brown chicka brown cow.
by mahtnamas October 20, 2011
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Used as code when you think a girl has brown nipples.
by Austin Vaught November 3, 2010
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jeeze your hot! :)
breaking the awkward silence.
what do you get when you cross and brown chicken and a brown cow
brown chicken cross' the road and runs into a brown cow and they become conjoined becoming brown chicken brown cow
by brown chicken brown cow master February 3, 2010
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