balderdash, n. 1. [16C–18C] any adulterated or mixed drink, typically milk and beer, beer and wine, brandy and mineral water, which, while duly consumed, was generally considered unpleasant. 2. used attrib., an innkeeper. 3. [late 17C–18C] obscenity. 4. sense 1, in fig. use, second-rate, ‘thin’. 5. [early 19C] a fool. 1 sub-entry