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1.
panty hose that is worn on top of a black man's head to keep his nappy wool from sticking up too far.
"You take off that nap sack when you are in MY court-room!"
by T. Wilson November 02, 2006
 
2.
1) place to store drugs
2) to sleep on ones balls
yo lets keep the weed in the napsack. I wanna put my face in your lap and get my napsack on.
by Napsack June 18, 2003
 
3.
It's another name for your balls.
Quit grabbin my napsack!
by necisito ir al bano January 06, 2007