萌君
[méng jūn]
'Moe King', where '萌(méng)' in this context stands for the cute or charming trait found in Japanese moe culture (which refers generally to any quality of a fictional character that inspires feelings of affection or fondness in the viewer). It's often linked to cute cartoon characters, anime girls/boys, etc., while 君(jūn) can mean 'sir'/'master'. So it shows a blend between a cute, adorable persona and respect, likely indicating admiration for someone/something adorably charming.