1.
fat person; fatty; fatso
A derogatory or teasing term for someone who is overweight. Considered rude and offensive in most contexts, though sometimes used self-deprecatingly or between close friends.
デブって言うな。
Don't call me fat.
Usage
A strongly informal and generally offensive word. Avoid using it to describe others directly, as it is considered rude. Sometimes used in a self-deprecating way (自虐的) or jokingly among close friends. The na-adjective form デブな can modify nouns (デブな猫, a fat cat).