Synonymous with Stupid things.

What is the meaning of ‘it’s your funeral’?

This is an expression that is mostly used in informal contexts. When you tell someone that it’s his funeral, what you mean is that the thing he intends to do is rather stupid. In other words, it’s your way of warning the person that he has made a wrong decision, and he is the one who is going to suffer the consequences.

*You want to go for a walk at this time of the night? It’s your funeral.

Courtesy-Know Your English-The Hindu.