The phrase "mother fleakers" seems to be a play on words or a euphemism, potentially derived from a more vulgar expression. It’s often used to express frustration or annoyance, similar to calling someone a "motherf***er," but with a more palatable twist. When said to two people, it could imply that the speaker is referring to both of them in a derogatory manner, perhaps highlighting their actions or behavior.
Context matters a lot with phrases like this, so the exact meaning could vary based on tone, setting, and relationship dynamics among the people involved. If you have more context or a specific situation in mind, I could provide a more tailored interpretation!