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A combination of the word fest (party) and incest.

It refers to the act of incest, but as a positive term, like "fest" in "beerfest". The word's origin dates back to the Garden of Eden and the short period after, when the only way for the human race to pass it's genes on was, you guessed it, infest. It was a great time.

After all; nothing's like family.
"I had sex with my granddaughter last night"
"Sounds like a great party"
"No, it was more than that. It was infest!"
infest by Granddaddy October 23, 2011
is the second album from the band Papa Roach. It was released in 2000 and features the songs Infest, Last Resort, and others. This album recieved a grammy nod.
Infest by xxBlack Flagxx July 12, 2010
to open your head up and see what's going on
We're going to infest. We're getting in you head
infest by Matt April 1, 2005
to screw a family member because you are unable to find anyone else
infest by cheese November 5, 2003

snoot infest 

When you're boyfriend is "friends"with a girl who has a really annoying voice.
Me: Chynna sounds like a man.
Ak: How do you know what she sounds like?
Me: How could I forget the most snoot infest noise in the world.
snoot infest by Aks girl November 16, 2013

Pseudo-incest 

Sex with someone with a familial relationship, but no blood relationship. Sometimes treated as incest in the law, but not as much of a taboo subject in common society.
"Dude, she's not my mom! She just married my father."
"So that's pseudo-incest. Still illegal in this state."
Pseudo-incest by Stevarooni September 11, 2016