fyntysiomynia

The act of adding the letter "y" in place of vowels in a word to make it sound more fantasylike. Someone who performs fyntysiomynia is called a fyntysiomyniac.

"I've never seen fyntysiomynia like this... I mean, you changed Camilla to Camylla, Jerome to Jeryme, and Bob to Byb. BYB."