To talk rapidly, incoherently, or indistinctly
Unintelligible or foolish talk
gabble or gibberish.
At the presentation introduce yourself by name make eye contact speak understandably - do n't gabble.
Some geese perform the threat call, some the contact call and others the feeding gabble.
As he got closer the gander heard the feeding gabble of other geese.
However, plugging Jonah into the mic socket produced a fuzzy unintelligible gabble as if he was speaking from the belly of the whale.