The word comes from the 1997 music album by the band Korn. It's a play on the word pornography, and means nothing.
Also, the word is used in the Family Guy series, S17E18, when Peter is caught watching Kornography.com, which was Corn Pornography, showing a hot piece of corn, that was given a facial of butter. It was most likely gay corn pornography.

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.