cooking on all four burners (not to be) [exp]

Meaning:

• a person who is kind of insane and is not normal in terms of mental health.

Examples:

1. My friend shouts and says hello to every stranger who walks pass beside him. I’m sure he is not cooking on all four burners.
2. After staying up all night studying, Sarah admitted she was not cooking on all four burners during her morning exam.
3. The old printer is not cooking on all four burners; it keeps jamming every few pages.
4. “You seem distracted today. Are you okay, or are you not cooking on all four burners?“
5. The team’s performance in the first half showed they were clearly not cooking on all four burners, but they turned it around after halftime.
6. After recovering from a cold, he joked that he was finally back to cooking on all four burners.