cromulent

I was unaware of the Simpsons episode in which this word was used. I am however familiar with the word used in the British comedy series Black Adder. Original air date of the Black Adder episode (Ink and Inkability), according to Wikipedia, in which this word appears is 09/24/1987. The Simpsons episode however was aired on 02/18/1996.

There is some discrepancy as the word "cromulent" does not appear in the original Black Adder script but Rowan Atkinson does in fact say the word cromulent on film. As I own the DVD and have watched that episode several hundred times I am very sure he said it.

Another good fake word that appears in this Black Adder episode is contrafibularity.

This word was invented by the Simpsons.

This word embiggens us all.