The thighs of a curvy voluptuous woman, famous in the 70s and early 80s period which adds a seductive, sensual appeal to the whole persona of the woman; unlike a skinny, lean pair of legs so much in fashion and so desired now.
Wow! Check out the thunderthighs on that woman, makes me want to make sweet love to her all nightlong.
Dan the man is a very pretty boy who is in love with frank whatever his last name is. He always watches movies with me and is amazing. He also loves sharks.
If you are friends with Mr Thunderthighs you are automatically cool.
Person: YOURE FRIENDS WITH MR THUNDERTHIGHS? HR SO COOL BE MY FRIEND.
n. A person who is so overweight that one's thighs rub together when he/she walks and creates a low rumbling noisedeep within the earth whenever he/she steps.
Holy christ! Here comes thunderthighs! Hold onto something! Brace yourselves!! *BOOM* (low rumbling noise)