👉 "On fumes" refers to a state of being irritable, anxious, or agitated due to a lack of oxygen or a feeling of being overwhelmed by stress or pressure. It describes a temporary but noticeable decline in mental clarity and emotional stability, often experienced when someone is under intense physical or mental strain, such as during a high-stress situation, after a long day of work, or when facing unexpected challenges. This term captures the sense of being "on edge" and unable to think clearly or relax.