muck

(noun) any thick, viscous matter. Synonyms: sludge, slime, goo, goop, gook, guck, gunk, ooze.

(noun) fecal matter of animals. Synonyms: droppings, dung.

(verb) remove muck, clear away muck, as in a mine.

(verb) spread manure, as for fertilization. Synonyms: manure.

(verb) soil with mud, muck, or mire. Synonyms: mire, mud, muck up. Example: "The child mucked up his shirt while playing ball in the garden."