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A stupid nickname you make up because you're too lazy to think of anything better than saying you can jack off.
My cousin is Jack Koff because he can't spell his own name and thinks he's a legend.
I'm Jack Koff because I once saw my dog try to eat my homework and it looked like a jackoff moment.
My gym teacher calls me Jack Koff because I talk too much and I look like I'm about to cum in class.