Top Definition
A pronounced underbite.

When the bottom teeth sit ahead of the top row of teeth due to the jaw jutting forward.

The clinical term for a shamgab is 'malocclusion'.
Check the shamgab on that big diddy - he looks like the banjo player out of Deliverance.
by stoatthebaw March 26, 2009
5 Words related to Shamgab

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