Top Definition
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.
by Led Zeppole October 26, 2003
A merging of 'thermal' and 'underwear' to give thunderwear
What are you wearing underneath your clothes?
What's that?
It's thermal underwear
by jaffaw February 25, 2012
Underwear for the obese.
"I like to make fun of fat girls who buy thunderwear at plus-size stores."
by JrBaconCheeseburger153 January 23, 2015
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