Past Nastification

(n.) The state or condition of one who has had sex with one's own grandmother in the 1950s, thus resulting in being one's own grandfather in the present/future. This condition may create genetic abnormalities.

Nibblonian: "It's a genetic abnormality which resulted when you went back in time and performed certain actions which made you your own grandfather."
Fry: "I did do the nasty in the pasty!"
Nibbler: "Verily. And that past nastification is what shields you from the brains. You are the last hope of the universe."
Fry: "So, I really am important? How I feel when I'm drunk is correct?"
Nibblonian 1: "Yes. Except the Dave Matthews Band doesn't rock."

Past Nastification by Pablo, King of the Spaniards December 14, 2008

past nastification

Sexual intercourse that happend in the past.

Dude 1: Dude, I think your past nastification may have some repercutions.

Dude 2: I did do the nasty in the pasty.

past nastification by Biggie Brown November 24, 2006

past nastyfication 

Going back in time to sleep with your grandma to spawn your own father. also known as "doing the nasty in the pasty".

Dude's his own Grandfather! He did some real past nastyfication!

past nastyfication by Friend of Supert3d May 4, 2010