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A vertical strip of hair underneath the lower lip that brushes the taint or the butt crack, depending on the orientation of the owner.

Also know as a flavor saver.
Gina longed for a boyfriend with a Jay Leno chin and a nicely groomed butt brush. Not only would a quality chin-hawk really hit the spot, it would double as a dribble catcher.
by Diana of the 1200 Block September 15, 2008
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