When a chick has no place to sit so she places herself (primarily her pussy) on one of your knees. Sitting there she will begin to move around and chat with other people while grinding away at making what is called a Knee Pie.
The other night I was chilling at the bar when this chick decided to sit down on my lap and make herself a Knee Pie.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.