1814, "slush, sludge," probably a blend of slush and slop in its M.E. sense of "muddy place." The verb meaning "to splash about in mud or wet" is from 1844. Meaning "to pour carelessly" is recorded from 1875. Sloshed "drunk" is recorded from c.1900.
tv. & in. to drink liquor, including beer; to drink to excess. : Are you going to slosh gin all night?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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