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Jackin ina Jag is when you jerk off in a fancy fast car to show off how rich you are and how much you love yourself.
I drove my Jag to the mall just to jack in it and show everyone my new car and my new cock.
He was jackin ina Jag on the highway and didn't even notice the cop behind him.
She texted me, 'Just jacked ina Jag and my phone died. Classic me.'