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1.
Thick layer of excrement plastered across the back of a toilet bowl following high-velocity bowel movements. Gravity and geometry conspire to fashion this matter into a beard-shaped carpet of filth.

Some beards can survive multiple flushes, leading to the ultimate ignobility of cleaning up someone else's beard to avoid implication.

Also known as a "manural".
Oh man, I just went to the toilet and some fellow had left a chocolate beard in there.
by Mr Casual May 11, 2006