Getting your own mother pregnant, then getting that daughter/sister pregnant. Therefore, it's a sister within a sister. Inception + Incest = Incestion
Woah, you got your mom pregnant? Then that child? INCESTION!
od uživatele Lily69 05. Březen 2012
INCESTion is the act of fucking your wife while she's pregnant and sticking your penus soooo far in that it goes In your babies mouth. Therefore, you are somewhat being an incest.
That incestion last night was sooo good. My baby is gona come out sucking dick like a pro.
od uživatele ILoveCheesecake 04. Listopad 2011
When one member of your family wants you to have sex with another member of your family.
"I want my sister to fuck my dad!"
-"Whoa, Incestion!"
od uživatele Marxe 13. Červenec 2013
When doing 69 with an exact replica of oneself, the person is giving pleasure to themself while reciving pleasure from themself, thus creating a split in the universe
-I saw a guy 69ing with his clone

-Are you crazy? I heard incestion was impossible!
od uživatele orangekiwicoconut 27. Září 2011

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