slop
n.
c.1400, "mudhole," probably from Old English -sloppe "dung" (in plant name cusloppe, literally "cow dung"), related to slyppe "slime" (see slip, v.). Meaning "semiliquid food" first recorded 1650s; that of "refuse liquid of any kind, household liquid waste" (usually slops) is from 1815. Meaning "affected or sentimental material" is from 1866.
2
late 14c., "loose outer garment," probably from Middle Dutch slop, of uncertain origin, corresponding to words in Old Norse and perhaps in Old English. Sense extended generally to "clothing, ready-made clothing" (1660s), usually in plural slops. Hence, also, slop-shop "shop where ready-made clothes are sold" (1723).
v.
"to spill carelessly" (transitive), 1550s, from slop, n.1. Intransitive sense from 1746. Related: Slopped; slopping.