A word that doesn't exist used in the "Mouse Diner" commercials, which features puns based on food and drinks to things related to the company, like computer support and the computers themselves. Mouse is a japanese company that makes computers, so it makes sense. "Unma" is just Umai but spelled wrong. Umai fundamentally means that someone is good or skilled at something, but can also be used to mean tasty like how "oishii" is! The fake word "unma" has no real meaning expressed though, so its up to interpretation.
by tenmatsukasa March 10, 2022