In text messaging and online slang, "dts" most commonly means "don't think so."
This abbreviation is used to express doubt, disagreement, or a lack of confidence in something someone else has said or suggested. It's a casual way to indicate that you're not convinced or that you disagree without being overly confrontational.
Example:
Person A: "It's going to be sunny tomorrow."
Person B: "Dts, the forecast said rain."
In this example, Person B is using "dts" to express their disagreement with Person A's statement about the weather. They are implying that they don't believe it will be sunny based on the weather forecast.