definition of
[muck up]

[1] #1 muck up v. make a mess of, destroy or ruin; "I botched the dinner and we had to eat out"; "the pianist screwed up the difficult passage in the second movement". wn

[2] #2 muck up v. soil with mud, muck, or mire; "The child mucked up his shirt while playing ball in the garden". wn