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1.
The back of the knee. The knelbow is to the leg as the elbow is to the arm.
If you get kicked in the knelbow you'll probably fall down.
by Dr. T. Awesome July 05, 2010
 
2.
the term used to describe your knee or your elbow, getting rid of the words knee and elbow completely
I tripped on that piece of paper and fell on my knelbow

Get your knelbow out of my face
by RobertEarl March 29, 2011