"Derailing" is a very broad term actually, as is the synonimous term "manscaping". It just means "I-DIDN'T-HEAR-THAT' and you can use it in all sorts of contexts.
Yes, like many terms it has a lot of meanings in different contexts. But I'm operating here within the context that Viliam_Bur and chaosmage established.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.