What is the meaning when it rains it pours?

The phrase, "When it rains, it pours" is simply to refer to the fact that if one bad thing happens, lots of bad things happen. When there may be a lot of things going wrong at one time in your life, or day, you may say "when it rains, it pours" to indicate that lots of crazy/not good things are happening. Perhaps you are stressed or feeling down because it is a rough time.