piff-ull | /ˈpɪf.əl/
n – Nonsense, foolish talk. v – To act or speak in a futile, ineffective, or nonsensical manner.
“I am tired of listening to their piffle and gossip.”
Unknown, 1847. Perhaps blend of piddle + trifle, perhaps puff (“(onomatopoeia, puff of air)”) + -le (“diminutive”).