Clear evidence of performing fellatio.
When they came out of the bathroom her hair was mussed; she might as well have had dirty knees.
by tman March 11, 2004
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(noun)
when a girl gives a boy head in a porta-potty, which results in her knees being covered in fecal material or piss. Once the man blows a load, and they clean up, the girl needs to use soap and water before her knees are to the original skin color.
Samantha has some dirty knees after the porta-potty incident.
by jacobito May 13, 2007
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When things get a little hot and she needs to suck on a popsicle
Yo she got dirty knees last night

Bruh last night she got really bad dirty knees
by D-Monkey February 25, 2018
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To Suck someones penis, while on your knee
yo, she be getting her knees dirty.

Yo she got dirty knees.
by kibblasona January 5, 2006
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anyone who gets on their knees to preform oral sex on a male
yo you been around the block. you be getting your knees dirty.
by Tazmanian devil May 19, 2006
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a female most likey a hoe whos on her knees all the time sucking dick
Shanise and Sharounda are the girls u need to be talking to ,they be getting they're knees dirty every night.
by Cece and Coco July 6, 2006
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