Yam

A yam is a tuber that is liked by Matthew Po. His liking for the vegetable is more conceptual than gustatory, with more focus on its name than on its actual consumption.

If a word contains a string of two letters that can be made into the word "yam" by insertion of the third letter, Matthew adds the letter into the word. For exyample, Matthew would use the second word in this sentence instead of the word, "example."