People who are messy, untidy, or careless about their appearance or surroundings.
From Middle English 'slob' (mud, slime), possibly from Irish 'slab' (spittle) or Old Norse 'slabr' (slippery). The sense evolved from describing something slimy to describing a person who is slovenly.
The word 'slob' originally meant actual mud and slime, but it gradually became a playful insult for messy people—the language essentially transformed the gross stuff into describing the type of person who'd get covered in it!
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