Bookah

"Bookah" as a phrase means inferior being, or outsider in Asurian. It is also the name of loud, bellowing, make-believe monsters that Asura created to scare children.

Trivia
In Polish language version word "bookah" is translated as "fajtłapa", which is insult similar to English "fool" (but not exactly). Also the word "Bookah" sounds very simular to the japanese word "Baka" which means idiot or imbecile