We don't know diddly squat .

我们根本不知道传染途径。

He gave me diddly squat for all my hard work.

对我的辛苦工作他只付了一点微不足道的报酬.

Most interns who work for our company learn diddly squat and spend their time doing menial work.

大多数来我们公司工作的实习生学习毫无价值的事情而且从事着卑微的工作。