To prattle and chatter unintelligibly, usally when feeling guilty or after some sort of wrongdoing
2 days after doing a runner from a taxi driver, his concience was finally pricked, until, like Hamlet's stepfather, he totters from the banquet, ghostly pale and gibbering with guilt!
by Sethmtut June 22, 2008
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1 : to fail at something suddenly, unexpectedly and colorfully

2 : to abruptly take your toys and go home
After his proposed fantasy football trade was not approved by a majority of the owners, Andrew hurled a half-eaten chicken strip across the room and gibberred the league. He later finished the chicken strip.
by thefoxx September 9, 2014
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A giant butt. Usually well toned and overall very attractive.
Look at the gibber on that girl.

Man, that girl I was dancing with had a gibber.
by Dictionariaste June 26, 2011
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When two (or more) assholes engage in a ridiculous online debate, each convinced that the other is an idiot and they themselves are morally superior. Often having no resolution; a gibberish debate.
This guy on reddit keeps trying to drag me into a gibberate.

He must be trolling, he won't stop gibberating.
by whiskeyandwaves May 2, 2014
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To speak nervously in a incomprehensibly fast, jumbled and inarticulate manner.
He can barely gibber his way through a conversation with a woman.
by OneBadAsp November 2, 2006
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Someone who engages bestiality.
1. Farmer Giles has been getting upset for the past few months, there's been a gibber bothering the sheep.

2. Martin lives in London, but likes to leave London for a weekend of gibbing.
by Bogdanovic February 3, 2007
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