Boy, do my boss make a blooper today! 哇,我们老板今天犯了一个大错误!
blooper
[ noun ] an embarrassing mistake <noun.act>
The June 28 page-one article on "Corn Belt Forecaster" Earl Finckle states that he forecast a "blooper in 1967" when he predicted two inches of rain and it snowed 20 inches.