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The act, or process of having sex with a female, BUT after the first ejaculation, regardless of noodle dick, you thrust through until the second ejaculation is complete, without pulling out.

Three ejactualations is considered a Legendary Johnny Rocket, but has never been performed successfully
Man you shoulda seen me bangin' this girl last night, I was Johnny Rocketing her and I sweatin buckets all over her back. I went for the Legendary Johnny Rocket but my dick shrinked up into my stomach.
by FattyOnATreadmill November 18, 2011
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