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"How now brown cow" is a phrase used in teaching a style of public speaking in which gesture, vocal production, and delivery are emphasized to demonstrate rounded vowel sounds.
Teacher: Work on your vowel sounds.

Student: "How now brown cow?"

Teacher: Rounder, please...
by Adm_Hawthorne July 25, 2006
Best courage the cowardly dog line ever.
"How now brown cow?"
I.E. (scene)
{"How.. now.. brown.. cow.."
by Srz July 23, 2006