belonging to a low social class, or typical of people who belong to a low social class

I can't bear her plebby friends. 我不能忍受她的平民朋友。

The Victorian middle classes wanted to show they understood it was plebby to cut your fish with a knife. 维多利亚时代的中产阶级想表明他们理解用刀子切鱼是平民的行为。