Merriam-Webster's Collegiate® Dictionary, 11th Edition
SLOSH
I. noun
Etymology: probably blend of slop and slush
Date: 1814
slush 1, the slap or splash of liquid, sloshy adjective
II. verb
Date: 1844
intransitive verb to flounder or splash through water, mud, or slush, to move with a splashing motion , transitive verb to splash about in liquid, to splash (a liquid) about or on something, to splash with liquid