la-di-da

1.(informal)（描述像上层人的说话或举止）装腔作势的，装模作样的，做作的used to describe a way of speaking or behaving that is typical of upper-class people but that is not natural or sincere

1.真可笑（用于讥讽自视过高惹人讨厌的人）used when sb is irritating you, because they seem to think they are more important than they really are