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Slang for someone who shoots an exceptionally large volume of ejaculate, typically after intercourse, and especially when a huge mess on the sheets and bedding results. Is a reference to the much-publicized oil spill from the 1980s.
Girlfriend1: Yo, look at those sheets! X-on must have been here!

Girlfriend 2: Ya, I'll be cleaning up for days.
by Shogun Xll March 20, 2007

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