Top definition
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."
by Jirta September 25, 2009
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug