What does blubber mean?
Blubber is the thick layer of fat found beneath the skin of whales, seals, dolphins, and other marine mammals. It serves vital biological functions: insulating the animal against frigid ocean temperatures, storing energy, and aiding buoyancy. In everyday English, the word also works as a verb meaning to cry noisily and uncontrollably, a use that carries an informal and somewhat mocking tone — one might describe a child as blubbering after losing a toy. Historically, blubber had enormous economic importance: rendered into oil, it fueled lamps and lubricated machinery during the whaling era, driving global whaling industries for centuries. Today the noun appears mostly in scientific, documentary, and culinary contexts (seal blubber remains part of some Arctic diets), while the verb survives in casual speech. Its vivid sound and double life make it a memorable word bridging marine biology and human emotion.
The thick layer of fat beneath the skin of whales, seals, and other marine mammals, providing insulation and energy storage.
"Whalers once rendered blubber into oil for lamps and soap."
Standard in scientific and historical contexts; uncountable when referring to the substance generally, though 'a layer of blubber' is common.
(informal) To weep loudly and uncontrollably.
"He blubbered like a baby when his team lost the final."
Informal and often condescending; implies excessive or undignified crying.
Rarely pluralized; blubber is almost always treated as an uncountable mass noun referring to the substance.
"The museum displayed samples of blubbers from various whale species."
Whale blubber was once so valuable it lit the lamps of entire cities — before petroleum made 'burning the midnight oil' mean something else entirely.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of blubber
Blubber first appeared in English in the late Middle Ages, likely borrowed from Middle Dutch or Low German forms such as blubber, related to words meaning something swollen, soft, or bubbling — the same root that gave English 'blob'. Its connection to whale fat became established through the medieval and early modern whaling trade, particularly among Dutch and English hunters. The crying sense developed by extension from the idea of swelling, bubbling emotion, and is closely related to the older verb 'blub', meaning to weep.
Related word forms
How blubber is actually used
As a noun, blubber is neutral-to-scientific in register, common in zoology and nature writing. The verb is informal and often slightly derogatory or mocking when describing someone's crying, implying excessive or uncontrolled weeping rather than dignified grief.
Easily confused with blubber
A blurb is a short promotional description on a book cover, whereas blubber is either animal fat or noisy crying.