n. a rude, fat, and unpleasant person. : What a slob! Comb your hair, if you can get a comb through it!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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1780, "mud, muddy land," from Ir. slab "mud," itself probably borrowed from Eng. slab "muddy place" (1610), from a Scand. source (cf. Icelandic slabb "sludge"). The meaning "untidy person" is first recorded 1861.