Underwear for the extremely obese, those who make the earth tremble when they walk.
See also thunderbra, thunderthong, thunderpants.
Three hundred and fifty pound Herb's thunderwear was big enough to cover the infield at Yankee Stadium.
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"I like to make fun of fat girls who buy thunderwear at plus-size stores."
A merging of 'thermal' and 'underwear' to give thunderwear
What are you wearing underneath your clothes?
Thunderwear!
What's that?
It's thermal underwear
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