Definitions by Robin Ruth

fathometh 

It is used as a way to express extreme surprise at a fact. Derived from the word "fathom" which simply means "to understand". Fathometh is used to mean "You understand?" or "Riiiight?" but in old English (or King James English).

Sarah: I can't believe Amy went back to her ex.
Jackie: Fathometh?

fathometh by Robin Ruth October 12, 2021