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The act of a man ejaculating into another persons mouth. The person who recieves the man gravy will then spit the gravy into a third persons mouth.
After Sam and Zack sucked Jim's penis Jim proceeded to ejaculate into Sam's mouth and Sam proceeded to spit the gooey mess into Zack's mouth thus completing the cumswap.
by Gook Nookem April 09, 2010