toffee-nosed
adjective UK informal disapproving uk/ˈtɒf.i.nəʊzd/ us/ˈtɑː.fi.noʊzd/
（尤指在地位低于自己者面前）自命不凡的，妄自尊大的
People who are toffee-nosed consider themselves to be better than other people, especially than people of a lower social class.
He's a toffee-nosed git - take no notice of him! 他是个自命不凡的蠢货——别理他！