noun which may take the genitive case particle 'no', na-adjective, noun
Colloquial adjective-like use (often derogatory) describing someone or something as fat or chubby. Can be used with な or の.
Colloquial noun referring to a fat person; often derogatory and insulting. Use with caution.
He got fat from overeating.
I might have gotten a bit fat lately.
That chubby cat is cute, isn't it?
That guy is just a fatso.
I was hurt when my classmate called me 'fatso'.
That cat is so fat it looks hard for it to even walk.
肥満 is the clinical, formal term for obesity used in medical contexts, while デブ is casual and often derogatory slang.
デブ is a blunt, direct insult for a fat person, while ピザ in this insulting sense is a narrower, more recent internet slang term with the same derogatory force.
Both 豚 and デブ are offensive insults for a fat person, but デブ only ever means the insult and never the animal.
Common katakana spelling; often used colloquially and can be derogatory.
Hiragana spelling, less common than katakana but still used.
The exact derivation is uncertain; likely a sound-symbolic or mimetic word related to the idea of being plump or swollen.