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
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