Top Definition
Accidental conception of a child due to an ovulating woman sitting on a patch of semen.

Rumoured to be the cause of the immaculate conception of jesus
"Mummy was i an accident?"
"Not just a an accident, but a cum stain conception as a matter of fact"
by Rhys Rohypnol July 28, 2009
7 Words related to Cum Stain Conception

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