If something is slitted, it has a long, narrow opening or openings.
The word slitted can make people think of eyes, clothes, or dangerous things.
Examples:
The cat has slitted eyes.
She wore a dress with slitted sleeves.
The slitted window let in a little light.
The slitted box was full of surprises.
The dragon's nostrils were slitted and smoky.
The slitted mask made him look like a superhero.