We were completely gobsmacked when she suddenly announced she was moving to another country.

gobsmacked 是一个英式俚语，由 gob（英式俚语中表示"嘴"）和 smacked（"被打"的过去分词）组合而成，字面意思是"嘴巴被打了一拳"，引申为"震惊得说不出话"的状态，相当于"目瞪口呆"或"大吃一惊"。这个词带有强烈的惊讶和难以置信的意味。