Top Definition
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!
Por Lily69 05 de marzo de 2012

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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.
Por ILoveCheesecake 04 de noviembre de 2011

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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!"
Por Marxe 13 de julio de 2013

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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!
Por orangekiwicoconut 27 de septiembre de 2011

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
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