Top Definition
The thin layer or sheen that covers you and your partner(s) after sexual intercourse. Including but not limited to mixtures of sweat, semen, and natural lubricants.
Not to be confused with, but of similar viscosity to liquid ectoplasm.
"I walked into your room and there was sextoplasm everywhere."

"There was either a ghost in here, or someone's been fucking in my room."
by Ikety November 14, 2008

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