The inside of your knee, opposite the kneenis.
Stop tickling my kneegina!
by verk August 21, 2006
The pocket of fat above the knee of an obese person...can be used for sexytime, storing personal items, or as a hand/foot-hold to reach the elbowgina (or other hole).
She wasn't fat enough for me to put it in the elbowgina, but the kneegina was a perfect fit!
by jimmy patrick February 14, 2008