这是一首简单的小情歌
[zhè shì yī shŏu jiăn dān de xiăo qíng gē]
'这是一首简单的小情歌'in English is 'this is a simple little love song,' likely referring to those sweet melodies that people hum casually, often expressing a person's feelings or mood at some moment; perhaps indicating simplicity and purity, and showing the user is probably in a romantic and soft sentiment when giving out this nickname.