Simple past tense and past participle of yabber. (verb)
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Use "yabbered" in a sentence
"For two days after Lizzie's arrival in camp, she refused to speak or eat; for the next two days she ate everything she could lay her hands on, but still kept an unbroken silence; and for another two days, whenever she was not eating, she "yabbered" so much and so fast that the other gins looked on aghast, unable to get a word in edgewise, so continuous was the flow of Hinchinbrook vituperation."
"He may have yabbered something about an "an incentive-based system to perform.""
"2009-11-21 21: 22: 05.0 - So i yabbered on about $MSFT killing modders 'XBOX Live subscript bcuz, well, bcuz they can!"