The phenomenon of increasingly rare and awkward instances of hooking up, making out, having sex, etc. that occurs primarily within small high schools where many of the students have grown together since birth. The reason being is that everyone has a pre-determined judgement of each other as well as viewing their fellow classmates as pseudo-siblings. To most people, the thought of hooking up with your sibling is a repulsive thought and therefore hooking up with a pseudo-sibling is equally disturbing. However, due to the lack of available mates, the students must commit the act of coitus or become pent up in their sexual frustration.
Example 1:

Rodolfo: Sup dude, I'm gonna try to hook up with Lauren at the kegger.

Alex: Dude you've known her since you were in pre-school, that shit ain't happening.

Rodolfo: Yeah you're right. Fuck High School Incest!

Example 2:

Heidi: I think I fucked Tony last night...

Serena: You redneck! You committed High School Incest!

Heidi: Not again!
by 12ssmalanskas September 10, 2011
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The act of having pure, heterosexual, vanilla sex with a partner that is not related to you in any way. No pissing, shitting, violence, or whatever other unspeakable ask that could be thought of.
West Virginian 1: I got laid last night.
West Virginian 2: With who?
West Virginian 1: Gabriella BigTits
West Virginian 2: Bro, that's some crazy West Virginia incest.
by RadRifle03 April 28, 2016
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An insulting name for the tv show/music group The Naked Brothers Band.
Oh boy time to watch some Nickelodeon. Hope some good shows are on, spongebob, maybe Danny phantom...oh great...it's The Gay Incest Band....
by Bassnium.exe October 2, 2023
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It’s basically a family reunion with extra steps, baby wipes, blood and Multiple rats.
Why didn’t you answer the phone?

I was at an incest fuck fest!
by Marypoppinthatpussy June 17, 2020
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A rumoured incest family that supposedly lives in Aberdeen. They do strange things and stick to their own.
by Chilner December 22, 2020
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mommy and daddy and baby make 3 which is incest pregnancy sex. Some people are oblivious others become pedophiles
by letsmakeachange October 30, 2020
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