A sharp, slender piece of facial hair broken off from a beard and stuck in your finger. Usually caused from rubbing your beard and can be painful.
M: So how was your day?
B: Pretty rough, actually. Lots of boring meetings, and then I got a beard splinter.
M: You got a what?
B: A splinter in my finger. From my beard.
by leighstarfish October 15, 2011
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