Almost all long words are shortened into abbreviated portmanteaus, like "SaiKyo" for "Saitama to Tokyo" or "koko" for "koto gakko".
It also has a fondness English loanwords, so things like "Mobile Game" become "MobaGe".
The problem is, despite their fondness for English words, most Japanese people aren't particularly familiar with English itself.
Sadly, I don't think that's really the appropriate contraction of "Rap Artist".
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