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While sleeping, you involuntarily force your hand down your pants and start beating your meat.
I tore my jirta during my napjack.

I had a great napjack last night.

While I was dreaming about Jessica Alba, I had a napjack.

My mom walked in on my napjack last night and called my pastor to pray for me.

"How was your night last night? Did you get laid?"
"No, but I had a very nice napjack."
Napjack by Jirta October 2, 2009
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Sat Navjacking 

When you don't have the luxury of a Sat Nav but follow other drivers who are turning off and taking short cuts at the instruction of their Sat Navs to avoid road delays.
The traffic was going nowhere so I resorted to Sat Navjacking a Mercedes who was obviously being guided around the blockage.
Sat Navjacking by PetuniaClash February 15, 2010
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.
napsack by Napsack June 18, 2003

napsacking 

The art of pretending to be tired before having sex so that you can immediately fall asleep afterwards and skip the pillow talk, emotional breakdown, honest confessions, etc..
I knew that she was wanting to talk about the abortion so I made sure to look like I was napsacking as soon as she came over.
napsacking by B-rad D. March 14, 2012

Ghandi Napsack 

A waste of a Gatorade. Often left on the highway. Occasionally filled with freight.
If I see anymore Ghandi Napsacks I'm going to pukers.
Quit grabbin my napsack!
napsack by necisito ir al bano December 9, 2008

austrilan napsack 

Taking a shit in a plastic bag and hitting some one with it till it bursts
Ben hit weston with an austrilan napsack and he puked all over his shirt