The Dictionary of American Slang from the HarperCollins Reference Library defines "jibber-jabber" as nonsensical talk. It came into Toobworld popularity in the 1980s with its frequent use by Mr. T as B.A. Baracus on 'The A-Team'.
But now the phrase is having a resurgence in the last few months.
On 'Boston Legal', it was the favorite phrase of Judge Robert Sanders (followed closely by "poopycock"). And in the finale of 'That 70s Show', it was uttered by Andrew, a somewhat upper-class Brit-like twit from the same isand (but the other side) where Fez grew up.
As for its use by the Master himself, sucka, Mr. T can be heard using it in "The New Adventures of Mr. T", a cartoon that makes up the "TV Funhouse" segment of 'Saturday Night Live'. And during a blipvert promo for his talk/"advice" show coming to TV Land in October.
There are a lot of blogs out there who've worked it into their names, so it's a good thing I didn't use it as well. Bad enough CBS is cranking up "innertube" for their online content. But at least I was using my version first.
They just have to deal with Richard Huff at the New York Daily News.