What is the origin of the idiom "browned off" and when to use it?

The phrase "browned off" is believed to have originated in British English, likely in the mid-20th century. It may have derived from the notion of something turning brown when it becomes overcooked or burnt, which can be associated with a sense of dissatisfaction or frustration. The expression can be used to express discontent with a specific situation, such as being repeatedly let down by someone or experiencing ongoing inconveniences. It is also used to vent about frustrating experiences, such as dealing with bureaucracy, enduring monotonous tasks, or facing setbacks.