Slob

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late 18th century: from Irish slab ‘mud’, from Anglo-Irish slab ‘ooze, sludge’, probably of Scandinavian origin.

wiktionary

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From Irish slaba. Compare slobber, which is of Germanic origin.

etymonline

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slob (n.)

1780, "mud, muddy land," from Irish slab "mud, mire dirt," itself probably borrowed from English slab "muddy place" (c. 1600), from a Scandinavian source (compare Icelandic slabb "sludge"). The meaning "untidy person" is first recorded 1887, from earlier expressions such as slob of a man (1861).