海绵没宝宝
[hăi mián méi băo băo]
'A sponge without a baby', this nickname borrows the cartoon image of Spongebob Squarepants. The term 'no baby' likely humorously indicates that the user hasn't any significant other or children, playing with words between Spongebob and sponge itself (as a nonliving thing that naturally has no babies)