那些男孩在背后嘲笑她是荡妇，这非常不尊重。

Those boys laughed at her behind her back and called her a slag, which was very disrespectful.

### 解释 slag 是名词，原指"矿渣、熔渣"，在俚语中用作侮辱性词汇，指"荡妇"或"滥交的人"，带有强烈的贬义和侮辱性。这种用法非常粗俗无礼。