What is the meaning of the idiom "crocodile tears"?

false tears

The correct answer is false tears. The idiom "crocodile tears" means to shed tears that are not genuine or sincere. It is often used to describe someone who is pretending to be sad or upset, but who is actually not feeling those emotions.

The other options are incorrect. Feeling really sad does not mean the same thing as "crocodile tears." To be sarcastic and to make fun of someone are both actions that can be done with or without tears, and they do not necessarily mean that the person is being insincere.