"THUNDER THIGHS" are a fat girls thighs that are so humoungous, big & fat that they clap together when they walk. This produces a loud noise which goes like "SLAP, SLAP, SLAP" , hence the "thunder" part of the word.Also causes earthquakes,volcanic eruptions,and tsunamis from just one clap.So make sure you stay away.People have been know to wander near the thighs and never seen or heard of again.EVER
by Chinfu December 25, 2014

a girl with EXTREMLY big thighs
wears tight skinny jeans to make her legs look small(doesn't work)
walks around like shes big
makes fun of people she thinks is "ugly" even though this girl is FUUGGLLYY!
wears tight skinny jeans to make her legs look small(doesn't work)
walks around like shes big
makes fun of people she thinks is "ugly" even though this girl is FUUGGLLYY!
by Le infamous March 12, 2009

by FlySqueaksFly March 10, 2011

when someone has extreeemely large thighs (guy or girl) may be a very muscly guy and may involve OVERHANG. these thighs are so powerful that when running is done by the individual, the ground may rmble like thunder hence 'thunder' and some times sparks may be produced like lightining.
A - "wooow what the hell is that???"
B - "EARTHQUAKE!!!!!!!"
A - "oh wait no its only Jimmy and Singo, jesus look at those thunder thighs!!!!!"
B - "EARTHQUAKE!!!!!!!"
A - "oh wait no its only Jimmy and Singo, jesus look at those thunder thighs!!!!!"
by zachary1604 February 23, 2009

by Kenny October 27, 2004

Of a woman, large, broad hips and thighs. One of the most tasteful images possible is a woman of such build in a bikini.
by IcyHaku December 1, 2004

A pejorative term for a person with large thighs, alluding to the sound of thighs hitting against each other.
Person 1: Whoa, check out thunder thighs over there. EARTHQUAKE!
Person 2: Actually, I think thunder thighs and wide hips are kinda hot.
Person 2: Actually, I think thunder thighs and wide hips are kinda hot.
by D-S July 16, 2008
