When your knee has a bump under it caused by a tendon popping out from growing too fast, formally known as osgood schlatters, usually most males in middle school will have it, hurts if pressure is applied
John: Yo are you okay your limping
Ryan: Yea I'm all good it's just my damn knee
by 8th Grade Trapper April 15, 2017
Get the Damn Knee mug.