萌哒哒的丢手绢
[méng dā dā de diū shŏu juàn]
The online name can be understood as 'A lovely game of handkerchief'. It evokes the lighthearted and playful image from a traditional children's game played in China (similar to Hot Potato) where children take turns running around and catching each other by putting down a kerchief. The user probably wants to express their lively character.