班主任是容嬷嬷派来的卧
[bān zhŭ rèn shì róng mā mā pài lái de wò]
Here '班主任' refers to a homeroom teacher in China. '容嬷嬷' is a strict nanny figure known from historical drama. The full meaning suggests a humorous way of viewing their teacher as overly authoritative similar to the strict nanny from popular culture, depicting them with exaggerated discipline methods.