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1. Underbeard
Facial hair that grows on the underside of the chin. This style of beard is frequently sported by the overweight, in which case it technically resides on their second chin.
"Kids, take a page from the Underbeard King and get rid of your neckal hair,
`cause you're lookin' like Chewbacca did a face-plant into Nair."

~ excerpt from the traditional Ballad Of The Underbeard
2. underbeard
the secret for quiz bowl success.
We would have never won that tournament if it weren't for that underbeard.
3. underbeard
Pubis hair (those around and above the vagina)
Horny pop babe flashes nice bit of underbeard.
by Vincent Vega Sep 10, 2004 add a video
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