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Literally: one who has been stuck in a hole or lying underground for an extended period of time to the point where his/her face has become the roots for an above-ground head of lettuce.

Commonly confused with: vegetarian, codswallop, Prince Caspian, homeless, loose leg.

This phrase can also be used as a compliment.
You should try his ganache. So light and perfect...he's quite a lettuce beard!
by Shapely December 06, 2010
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