“打小报告”的意思是偷偷向老师或上级说别人的坏话或不好的事。

"打小报告" means secretly telling the teacher or a superior about someone else's bad behavior or faults.

这个词常常带有不好的感觉,因为大家不喜欢在背后告状的人。

This term often has a negative connotation because people dislike those who report others behind their backs.