The JoMoSenpai means in slang: Legend streamer who is 8 feet 11 inches tall and built as a bear. Ses luscious lakes will be a distraction for all who see him. JoMo will punish you with the power of 1,000 gods if you shame someone. Aside from his amazing singing ability, he was also known for being able to utter the words “never gonna leave you down by Rick Astley” on-the-spot. It also laughs just like a dolphin, but it’s ***** so it’s fine. (in Slang Dictionary, added by Oviferous)