mogo-mogo
Speaking unclearly, often because the mouth is full of food or because of embarrassment. The words come out muffled and hard to understand.
💡A child eating and talking — 'Don't talk mogo-mogo with food in your mouth!'
口にものを入れたままもごもご話さないで。
Don't speak mogo-mogo with food in your mouth.
He answered ___ while chewing his sandwich.
彼はサンドイッチを食べながら○○と答えた。