A man or women that has massive thighs and legs that look fat, possibly disproportionate to the rest of their body.
Look at those woman's legs, she has thunder thighs
by D_masters June 10, 2012

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Anyone with disproportionately large upper legs; specifically, L. Chroman.
Oh SH!T, THUNDER THIGHS is about to kick the door down...Los!Los!Los!
by jj colt September 17, 2003

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A name of a girl that uses the fat of her thighs to ejaculate a man. When finished both become thunderstruck
Gina is quite the thunder thighs.
by bobbyddd November 24, 2014

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muscular thighs that anyone would want. Thighs of steel. Usually thighs of a soccer player.
Laura: How's soccer going?
Jamie: It's awesome, check out my thighs!
Laura: OMG, you have thunder thighs - hard as a rock,
by Tiffffany July 21, 2011

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A name of a girl that uses the fat of her thighs to ejaculate a man. When finished both become thunderstruck
Gina is quite the thunder thighs.
by bobbyddd November 24, 2014

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"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
Damn son another girl must have Thunder Thighs cause there is a earthquake happing right now!
by Chinfu December 25, 2014

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When a person's thighs are so large, they clap like thunder.
Did you see that girl's hips? Damn she's got some thunder thighs.
by hKbA October 17, 2010

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