'itcher' originates from the English word 'itch', specifically the verb 'itch', where 'itch' meant 'to have or cause an irritating sensation on the skin'.

'itch' changed from the Old English word 'giccan' and eventually became the modern English word 'itch'.

Initially, it meant 'to have an irritating sensation', but over time it evolved into its current meaning of 'a person or thing that causes itching'.