这是双眼皮这是单眼皮
[zhè shì shuāng yăn pí zhè shì dān yăn pí]
'这是双眼皮这是单眼皮' roughly means 'this is double eyelid this is single eyelid'. It refers to the differences in physical traits of human eyes. In this context, it is used humorously as a nickname which suggests the user has an easygoing personality and finds humor in the most everyday elements.