pageloss
Pageloss is when you make a post with good content to a forum that ends up being the last post on a thread page, then soon after someone adds a crap quality post to the thread that starts a new page, leaving your Good Post on the previous page where it will be lost to the sands of time.

If you notice a Good Post that just got pagelossed by a stupid post, it's generally good manners to quote it, including all of its content, on the next page.

This term is pretty specific to the Blockland forum but gets some use elsewhere.
Can't believe nobody will see the post I spent 30 minutes researching because some moron pagelossed me with a dumb copypasta