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When you grab your jacket, throw it over your junk, slide your arms through, and jerk off in public because your cock is too horny to wait.
I was on the bus and had to Jacket and Jack It because my pants were too tight.
At the grocery store, I had to Jacket and Jack It in the cereal aisle.
During lunch break, I Jacket and Jack It in the parking lot because I had no self-control.