Dirty liquid or soft waste, or poorly made food that tastes unpleasant and unappetizing.
From Old English 'sloppe,' possibly related to 'slip,' originally referring to muddy or wet ground, evolving to describe any messy liquid or waste material.
In medieval times, 'slop buckets' caught dirty dishwater which pigs ate, then pigs became the primary way people recycled food waste—nothing was wasted in pre-industrial life because slop was literally too valuable to discard!
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