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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
Related Words

rubberhead 

a young male drunk. Enjoys 6 cans, 10 pints, 2 shots of aftershock and a bit of sick on a typical night out. Regular meetings (rubber sessions) can take place between groups of rubberheads. Rubberheads can be found 'out on the rubber' getting 'rubbered' any time outside normal office hours.
no rich you cannot come to the dinner party on friday cos you will just be the rubberhead in the corner getting rubbered and then you will puke on dixons dress.
rubberhead by Icer April 28, 2004

Rubberwhacked 

To hit someone with a seamen filled condom across the cheek.
Joe: dude, me and my girlfriendhad sex lastnight.
Marty: Awesome! wut was it like
Joe: i rubberwhacked her cuz sheswas being a bitch
Marty: why,wut'd she do?
Joe: she had her period, and made fun of my huge cock because it was so huge and cockish
Marty: Yes. Yes. Y-E-S.
Rubberwhacked by Catherby September 3, 2006

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

rubberhead 

A sex act in which an outwardly straight man performs oral sex on another man. The term refers to the use of a condom, which the "straight" man views as preserving his heterosexuality.
Pete only gave Jim rubberhead, so he was confused when Jim wanted to then put it in his ass.
rubberhead by inthenavy September 8, 2010

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