'Slabbier' definitions:
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Slabby \Slab"by\, a. [Compar. Slabbier; superl. Slabbiest.]
[See Slab, a.]
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1. Thick; viscous.
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They present you with a cup, and you must drink of a
slabby stuff. --Selden.
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2. Sloppy; slimy; miry. See Sloppy. --Gay.
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