'balderdash' originates from an unknown origin, possibly from the 16th-century English word 'balderdash,' which referred to a frothy liquid or a mixture of liquids.

'balderdash' changed from a term describing a frothy liquid to its modern meaning of 'nonsense' in the 17th century.

Initially, it meant 'a frothy liquid or mixture,' but over time it evolved into its current meaning of 'nonsense.'