: nonsensical talk or action : trivial nonsense
"As a teen, he naively believes that what he needs to know about driving will be found in those little pamphlets and the Registry's so-called 'Rules of the Road.' I say that's balderdash bordering on folderol." – Craig Salters, Wicked Local Nantucket, December 12, 2012
About the Word:
Where else would a word for "nonsense" come from but nonsense? Folderol originated in fol-de-rol, a nonsense refrain in songs.