1. Onomatopoeia: This is the most literal meaning, referring to the sound of a doorbell or other similar device.
2. Interjection: "Ding-dong" can be used as an interjection to express annoyance or exasperation, similar to "oh, bother!" or "good grief!"
3. "Ding-dong merrily on high": This phrase comes from a Christmas carol, and is often used humorously to refer to a festive or joyful occasion.
4. "Ding-dong the witch is dead": This is a phrase from the musical "The Wizard of Oz", and is often used humorously to celebrate the demise of a disliked person or entity.
5. "Ding-dong" as slang: In some cases, "ding-dong" might be used as slang for a person, often with a derogatory connotation. However, this usage is relatively uncommon and considered offensive by some.
It's important to note that the context of the situation will determine the meaning of "ding-dong". If you are unsure, it is always best to ask for clarification.