Muck Up:
To mess up, soil (literally and figuratively), ruin, confuse.
Examples:
I need to stop before I muck up the whole thing.

Definition from the English-Bulgarian dictionary:
Muck [mʌk]:
- Animal manure.
- colloquial Dirt, rubbish (literally and figuratively), something nasty/unpleasant, disorder.
- Slander.
- Mud.
- American mining Excavated soil, blasted rock.
- To fertilize, fertilizing.
- To soil, dirty, mess up, pollute.
- American mining To clear rock.
- To clean, remove manure/rubbish.
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