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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 26, 2018
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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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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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