What is the origin of the idiom "fed up to the back teeth" and when to use it?

The phrase "fed up to the back teeth" is an idiomatic expression that originates from English-speaking regions, particularly in the United Kingdom. It is a figurative way of expressing extreme frustration or annoyance with something or someone. This expression can be used in various situations, such as expressing discontent with repetitive tasks at work, dealing with ongoing conflicts, experiencing continuous delays or disruptions, or feeling overwhelmed by a specific problem. It serves as a vivid and emphatic way to convey a deep level of irritation or exasperation.