When you scuff something, you scrape it in a way that leaves a mark. You might walk very carefully down the street in your new red cowboy boots, being careful not to scuff the toes.
You can scuff a floor by moving heavy furniture, or scuff your new leather backpack by dragging it on the sidewalk. It's easy to scuff new shoes or to scuff your dad's car interior when you try to cram your bike into its hatchback. Scuff also means to drag your feet, the way a reluctant child might do on her way into the dentist's office. The word scuff is Scottish, possibly from a Scandinavian root.