When something like ink or paint gets wiped or spread around on a surface, you say that it "smeared". Other things that can "smear" include:

• makeup
• toothpaste
• sauces

Here's how "smear" fits in a sentence:

 I accidentally smeared the ink.

My lipstick smeared.

There's pasta sauce smeared all over your shirt!

Another word with a similar meaning (but less common) is "smudged".