Makes lots of sense actually.
If we assume that people (on the internet and in general) prefer to address others of familiarity in abbreviated forms of their full names in 5-letters and less.
Belaslav=Bela
Ivramire=Ivra
Blaaaaaaaahs=Blahs
Hessah=Hess
Monochrome=Mono
Since
mono is already established in popular culture as an informal designation for an infectious disease, they thus change one letter and voila, "mo
no" = "mo
mo"
And it's Japanese!!!