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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

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

brunderwear 

panties that are so high they can double as a bra.
it was worse than grannie panties...it was BRUNDERWEAR

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

Runderwears 

tiny pants? that serious runners wear; resemble underwear but are athleticky
Wow look at how fast she runs in those runderwears! The lack of fabric must make her so aerodynamic
Runderwears by cgod March 28, 2019

Krundergarments 

The most polite way of referring to 'Krunderpants' (official branded underpants of the band Kreye).
My gosh, you may need a new pair of Krundergarments, old chap!