Top Definition
when ones thighs seem to only grow, even when the person exercises and diets.
person a: dude so you know how i lost all that weight?
person b: yeah.
person a: so i went shopping to get new clothes and i couldn't get any pants over my thighs, even though i have lost weight.
person b: man sounds like you have come down with a classic case of thunder thighitis.
by Alex Sehlinger January 30, 2009

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