1. A worthless mixture, especially of liquors. Indeed beer, by a mixture of wine, hath lost both name and nature, and is called balderdash. Taylor (Drink and Welcome). 2. Senseless jargon; ribaldry; nonsense; trash.
To mix or adulterate, as liquors. The wine merchants of Nice brew and balderdash, and even mix it with pigeon's dung and quicklime....