From an etymology site:Exclamations are a natural part of language. My mom very occasionally would say balderdash. I wonder what that derived from. Anyone have an idea about that? It seems like an innocent enough exclamation...
balderdash (n.)
1590s, of obscure origin despite much 19c. conjecture; in early use "a jumbled mix of liquors" (milk and beer, beer and wine, etc.); by 1670s as "senseless jumble of words." Perhaps from dash and the first element perhaps cognate with Danish balder "noise, clatter" (see boulder). "But the word may be merely one of the numerous popular formations of no definite elements, so freely made in the Elizabethan period" [Century Dictionary].also from 1590s