When you perform anal oral and you notice you have a chocolate milk tongue afterwards.
OMG, like last night, I was putting my toungue into my girl friend butt and like afterwards, my toungue was brown, ewwww I had a brown cow.
by Frank Mancuso October 25, 2005
a form of a charlie horse. to pull off a brown cow, you have to slide down on the strings of a guitar, and when you reach the end of the fret board, lift your hand off and punch someone close by with a lot of power.
during music class, josh turned around and brown cow'd greg right in the arm
by jordon_guv June 03, 2005