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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
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