Mucky means covered in thick, wet, dirty mud or other gooey mess. After playing outside on a rainy day, your shoes might be completely mucky. A pig rolling in its pen gets wonderfully mucky. A garden path after a storm becomes a mucky mess that squelches under your boots.

The word captures that particular combination of wet and dirty that makes things sticky and unpleasant to touch. A mucky pond has murky, muddy water rather than clear water. Mucky hands need more than a quick rinse: they need serious scrubbing with soap.

You'll also hear mucky used to describe confusing or messy situations that aren't physically dirty. Someone might say a complicated argument got mucky when people started bringing up too many unrelated ideas.