He/She is a sandwich short of a picnic
形容某人不太聰明,缺乏常識或智力不足。
非正式場合,幽默或貶義地評價他人智力。
英文釋義
The person is lacking intelligence.
例句
Don't expect him to solve the problem; he's a sandwich short of a picnic.
典故來源
源自野餐時食物不齊全的比喻,暗示缺少關鍵部分,引申為智力欠缺。