A girl will have red knees if she has been giving blowjobs to a lot of guys, or to one guy repeatedly.
"Damn, have you seen Esther. She got them red knees."

"Yeah, her and Johann have been going nonstop."
by RedKneesEsther January 22, 2015
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This action is usally performed after a long period of rain. This is when a person on a knee bord is dragged by a 4 x4 vehicle... most likely a 4 wheeler.
After all dis dong gon rain we's shoulds get out the 4 wheeler scooter n go knees bordin
by Big Sep June 17, 2005
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