jack ninja
A guy who can jerk off without anyone noticing. He’s like a sneaky little rat in a room full of sleeping cats.
My buddy was a jack ninja during math class. The teacher was talking about fractions and he was busy with his own math.
I saw my dad at the kitchen table. He was eating cereal and jerking off like it was a normal thing to do.
At the movie theater, I watched my brother do the jack ninja during the trailer. He didn’t even blink.