A common ailment associated with having too much Swag. Posting twitter photos with your mate telling the world what new 'kicks' you're rockin can be particular stressful on the knees. A particularly Swag hat will weigh down heavy on the knee caps.
Daniel Sturridge is so Swag that the Liverpool doctors can't cure his SwagKnees. He's out till next season
What one gets when giving a blow job while kneeling on the carpet. The knees get dry/ashy and impressed with the carpet weave pattern. Not as serious as rug burns.