Past tense of blubber; spoke indistinctly while crying; talked in a tearful, blubbering manner.
Regular past tense of 'blubber,' which itself is onomatopoeia related to 'blob' and the sound of crying or movement of fat.
Blubber as a verb—to speak while crying—became famous through literature because the sound is genuinely difficult to describe without making it ridiculous, which is probably why it's often used for comic effect.
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