有些不那么合群的人,他们到哪里都是自己待着,吃饭也不跟别人一起,而是自己带便当。当然,还有一些人不一定是喜欢自己待着,而是因为一些原因,没有人愿意跟他们在一起。
Lunchbag refers to loser or a person with no friends, doesn't "fit in" and does nothing right. These were people who brought lunch to school or office in a bag, then went off to sit and eat it alone because no-one liked them.