WITR
Why is this relevant
WITR is a quick way to address the relevance of something when messaging online or texting. For example, you may send an article to your coworker, and they may message you, "thx for sharing but witr" to ask why the article you shared is relevant.
People may also use WITR in contexts other than questions. For example, a LinkedIn user may share an article about the importance of workplace environments and caption it with, "WITR: 75% of employees surveyed displayed increased productivity when comfortable in their workplace. Are you making your workplace environment safe?"
While WITR typically means "why is this relevant," people may also use it to mean "when is this relevant" or "where is this relevant." You will typically understand which meaning they are using based on the context in which they use it.
Example
How well do you know your texting slang?
Before someone you're chatting with shares a secret or explicit message, they might ask WITR (who's in the room). This person wants to make sure no one could possibly look at your screen and read the message they're about to send.
In many cases, WITR is a red flag, which signals that a conversation is about to veer into inappropriate or unseemly territory. If you're not okay with that, you may want to say that someone else, such as your parents, siblings, or roommate, is in the room with you (or even better, that you need to go AFK).