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The act of ejaculating a lot uncontrollably during intercourse. The semen covers the partners entire body as if they are "swimming" in semen.

"I was fucking my wife last night and there was so much semen we let it swim."

(during intercourse)
Man: "Ohhh there's so much semen!!!"

Woman: "Just let it swim hun"
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by TheRev31415 March 08, 2014
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