Top Definition
An extremely obese individual who is also a keen sheep shagging enthusiast. Usually found in the shire of Tomatin, these hugely fat beings spend most of their days grazing on square bars and nature valley snacks. When there are not busy eating, they like to chase sheep until the late hours of the night - eventually leading to sex.
Have you seen where all the sheep have gone? Must have been the thunderbelly.....
by Stretchel November 18, 2010
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