When I image-google "thunder thighs', there seems to be a huge range of what people think of as thunder thighs. They include grossly obese, just chubby, lean but muscular sporty, non-muscular 'normal', normal thighs with some cellulite showing, and even a bunch that I would label as downright slender. The interesting pattern seems to be that the thinner ones are labeling themselves as thunder thighs, whereas the heavier ones are being labeled as thunder thighs by others.
Sheesh.