What does it mean to do something with a don?

Answer 1

Don (ドン) is a sound effect used in manga. In anime format, this effect often sounds like a loud "boom" or drum beat. It is often used to emphasize something happening.

Example: a person appearing on the scene, the scene pauses for a moment while the character's name appears and as the text for the name comes on the screen the sound effect "Don!". By adding the "Don!" effect, this implies the person is very important to the storyline.