Something you say when you are leaving in order to conceal your true purpose for leaving especially if you are going to see your drug dealer or going to get high.
Me: Where you going, Brian?
Brian: I'm going to see a man about a horse.
Joe: Hide the snacks...He's gonna have the munchies when he gets back!
Me: Yeah...You wanna go to the bar?
Joe: Yeah
by Open Side September 21, 2009
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Going to the toliet to urinate, in reference to a horses trough so the term only applies to men.
by Aaron Fielding January 31, 2008
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