当年2B还只是鉛笔
[dāng nián 2b hái zhĭ shì qiān bĭ]
'In the old days, 2B was just a pencil.' It plays on pun in Chinese: both the grade of pencil (2B) and behaving stupid or foolish can be pronounced similarly ('èr bī'二逼). So, it implies that what once seemed innocent now seems much less so. The netname conveys nostalgia and criticism of social morals deterioration.