the.com/balderdash

means Speech or writing that is senseless, exaggerated, or empty of real meaning.

from The word surfaces in the 1500s meaning a jumbled, frothy mixture of liquids — think beer slopped together with wine, or milk with beer — a slapdash, unappetizing brew. From that literal sense of 'nonsensical mixture' it slid naturally into talk: jumbled words with nothing solid behind them. The deeper root before that is murky and not reliably known, so any flashier backstory beyond the 'mixed drink' sense is best treated as folklore rather than fact.