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."