Definition of blathers:
(v) :
(intransitive, derogatory) To talk rapidly without making much sense.
(v) :
(transitive, derogatory) To say (something foolish or nonsensical); to say (something) in a foolish or overly verbose way.
(n) :
(derogatory) Foolish or nonsensical talk.
(n) :
Obsolete form of bladder. [(zoology) A flexible sac that can expand and contract and that holds liquids or gases.]