Why do people keep adding this to their comments? Are they checking notes? Why do they feel the need to point it out if they are? Why are they saying they are if they aren’t? It’s like me adding “scratching head” to my comment, which I just did, but I have no idea why that adds anything to the conversation.
When something is really unbelievable (or sarcasticly unbelievable) people add “checks notes” to signify that they had to check their notes (figuratively) to make sure that they aren’t saying something false