What is the origin of the idiom "be all thumbs" and when to use it?

The idiom "be all thumbs" has its origin in the notion of someone being clumsy or uncoordinated with their hands or fingers. The phrase signifies a lack of dexterity or finesse in handling objects or performing fine motor skills, as if all their fingers were thumbs. It is a figurative expression highlighting a person's clumsiness or lack of skill in tasks that require manual coordination.