Cotton panties or underwear that have been farted in so many times that the fabric near the anus becomes partially transparent to the point where the spot is distinctive.

Sunderwear is never shit stained nor is it created by direct contact with poo matter. Rather it is created by the various chemicals in the fart acting upon the underwear fabric.

he sure does, i bet he has a whole drawer filled with sunderwear.

Sunderwear by flapjack27 December 8, 2010

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slunderwear

A pair of particularly scandalous or slutty panties; like the tiny, black lace, completely see-through ones that you feel awkward washing with the rest of your clothes because they are just that sexual, or Heaven forbid you use a public laundry room and they should fall out of the pile onto the floor before a crowd of judgmental eyes...or your mom.

Kathy made the unfortunate mistake of wearing slunderwear under her dress on a breezy day.

slunderwear by xXIwearconservativepantiesXx July 15, 2009

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thunderwear

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.

thunderwear by Led Zeppole October 26, 2003

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hunderwear

Hunderwear (contraction for hair underwear) is a very dense patch of pubic hair, usually on a woman, that extends from just below the navel to the upper thigh front and back and is typically the result of an extreme case of winter bush.

Oh man, she's really hot except she's sporting a massive pair of hunderwear.

hunderwear by carpet bagger February 1, 2013

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