The Collaborative International Dictionary
Slabbiest
Slabby \Slab"by\, a. [Compar. Slabbier; superl. Slabbiest.]
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Thick; viscous.
They present you with a cup, and you must drink of a slabby stuff.
--Selden. Sloppy; slimy; miry. See Sloppy.
--Gay.
Wiktionary
slabbiest
a. (en-superlative of: slabby)