motor-mouthing
verb (present participle)UK /ˈməʊ.təˌmaʊ.ðɪŋ/
US /ˈmoʊ.tɚˌmaʊ.ðɪŋ/
Talking and talking without stopping.
He kept motor-mouthing about dinosaurs all through lunch.
OTHER MEANINGS
2. Speaking so fast that it is hard for others to get a word in.
She was motor-mouthing so quickly that nobody could answer her.
3. Saying too much without thinking first.
His motor-mouthing got him in trouble at the dinner table.
4. Chattering noisily and endlessly about small things.
The kids were motor-mouthing in the back seat the whole ride.