帅十三萌十三
[shuài shí sān méng shí sān]
The username 'Shuai Shisan Meng Shisan' combines the concepts of being 'handsome (帅:shuai meaning cool/stylish)' with 'adorkable or cute' as represented by 十三 (shisan literally meaning thirteen). This gives off vibes of someone who is both attractive and irresistibly adorable.