piffle

(noun) trivial nonsense. Synonyms: balderdash, fiddle-faddle.

(verb) speak (about unimportant matters) rapidly and incessantly. Synonyms: chatter, palaver, prate, tittle-tattle, twaddle, clack, maunder, prattle, blab, gibber, tattle, blabber, gabble.

(verb) act in a trivial or ineffective way.