"Cherchez la femme" is a French phrase that means "look for the woman".
When people say this phrase, they mean that if something mysterious or strange is happening, you should try to find out who the woman behind it is.
It doesn't always mean that a woman is causing trouble or doing something wrong, but it does mean that women often play an important role in things that happen.
It's kind of like playing a game of "Where's Waldo", but instead of looking for Waldo, you're looking for the woman who might have some important information or connection to what's going on.