Sukuchina
Uchinaaguchi (Okinawan) roughly translating to "silly". Alternatively spelled "sukutina", "スクチナ", or "すくちな". Never written using kanji (that I'm aware of).
Alice: Do you know how to use "sukuchina" in a sentence?
Bob: It would be sukuchina not to know!
Bob: It would be sukuchina not to know!