Blubberbrain is a rare, mildly derogatory slang insult for a stupid person — someone whose brain is metaphorically soft and flabby, like blubber (whale fat). The compound uses 'blubber' to evoke softness, wobbliness, and uselessness rather than hardness and efficiency. It is a slightly arch, almost literary insult compared to more common terms, and its rarity gives it a certain comedic specificity. Register is informal and dismissive but not especially aggressive.
Of all the blubberbrained ideas he had come up with, this was the worst.
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(slang, derogatory, rare) A stupid person.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.