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1.
The act of speaking foolishly and without purpose, often annoying others in the process. Talking at length for the sake of hearing one's own voice.
The stupid twit wouldn't stop blithering about how 'deep' her favourite fad author is.
von FeO2 27. August 2010
 
2.
often used as a prefix it "idiot", meaning incompetant
"my god, you BLITHERING IDIOT! HOW COULD YOU HAVE DONE SUCH A THING?!?!"
von all knowin' 26. August 2003
 
3.
Very Much So!
My Uncle is a blithering IDIOT! :P
von Secret Stranger(; 26. Dezember 2009