https://en.wikipedia.org/wiki/Hiroyuki_Nishimura

>Users on 4chan refer to him commonly as 'hiro' but also by the ethnic slur "gook moot", or the nickname "Jackie 4chan", "Hiroshima Nagasaki," or simply "hiroshimoot".

That's kind of misleading because it lists hiroshimoot alongside blatantly racist nicknames. But hiroshimoot simply appears to be the names of two people mixed together.