Trunderwear 

Extra underwear you keep in your trunk...just in case.

Crashcakes is heading to Sam's Club to replenish her trunderwear for the weekend!

Trunderwear by F.U.B.A.R.bie #32flv September 29, 2011

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

runderwear 

The skin-tight underwear that comes pre-sewn on a pair of super duper short running shorts.

timing girls: "Holy shit, you're not wearing any underwear!"
super fly runner guy: "I, as a matter of fact, am not. I am wearing runderwear. Look!"

runderwear by teeeheeee October 31, 2008

Thunderwear

Underwear for the obese.

"I like to make fun of fat girls who buy thunderwear at plus-size stores."

Thunderwear by JrBaconCheeseburger153 January 23, 2015

brunderwear 

panties that are so high they can double as a bra.

it was worse than grannie panties...it was BRUNDERWEAR

brunderwear by Cleveland, OH glam squad July 20, 2009

runderwear 

The undergarment worn on the waist to thigh and pelvic region when running, either for exercise, sports, pursuit or evasion. This undergarment absorbs perspiration and holds the genitals intact. It should not be worn continually after running, and should be washed soon afterwards.

"When I finished jogging at the track today, my runderwear were soaking wet and quite pungent!"

runderwear by Joefeather May 15, 2013

Thunderwear

A merging of 'thermal' and 'underwear' to give thunderwear

What are you wearing underneath your clothes?
Thunderwear!
What's that?
It's thermal underwear

Thunderwear by jaffaw May 10, 2012