那些年同桌之间的暧昧
[nèi xiē nián tóng zhuō zhī jiān de ài mèi]
This nickname translates as 'The Ambiguity Between Desk-Mates in Those Years'. In China, 'desk-mate' often refers to the classmates sitting at the same table in class. Here it depicts some uncertain or ambiguous feelings among them during the past years, probably hinting at the vague yet beautiful emotions budding during schooldays.