Definitions by 24 guys
shut up mokuba
A catch phrase of Seto Kaiba, usually directed towards his younger brother Mokuba Kaiba. It is used to tell the person it is directed at that they are very annoying and that they should remain quiet.
shut up mokuba by 24 guys November 22, 2017
koiba
A term used by Joey Wheeler to describe Seto Kaiba in YGOTAS. Due to Joey’s Brooklyn accent he could only pronounce “Kaiba” as “Koiba”. It can be used to describe someone who is rude, lacking in personality, or has a dragon fetish.