Merriam-Webster's Collegiate® Dictionary, 11th Edition
SLOP
I. noun
Etymology: Middle English sloppe, probably from Middle Dutch slop; akin to Old English oferslop surplice
Date: 14th century
a loose smock or overall, short full breeches worn by men in the 16th century, articles (as clothing) sold to sailors,
II. noun see: slip
Date: 15th century
soft mud ; slush , thin tasteless drink or liquid food, liquid spilled or splashed,
4. food waste (as garbage) fed to animals ; swill 2a, excreted body waste, a product of little or no value ; rubbish , sentimental effusiveness in speech or writing ; gush ,
III. verb (slopped; slopping)
Date: 1557
transitive verb
1. to spill from a container, to splash or spill liquid on, to cause (a liquid) to splash, to dish out messily, to eat or drink greedily or noisily, to feed slop to , intransitive verb to tramp in mud or slush, to become spilled or splashed, to be effusive ; gush , to pass beyond or exceed a boundary or limit