老师就是容嬷嬷的后代容嬷嬷是班主任的亲戚
[lăo shī jiù shì róng mā mā de hòu dài róng mā mā shì bān zhŭ rèn de qīn qī]
In a popular Chinese historical drama, Yongzheng Dynasty, 'Lady Rong', portrayed as a strict yet loyal caretaker, becomes shorthand here for an authority figure, similar to what one imagines a school teacher to be. The username implies teachers (or even particular teachers) are seen as both intimidating/authoritative and possibly part of a long tradition or lineage of disciplinarians