For anyone 'out of the loop':

https://www.reddit.com/r/OutOfTheLoop/comments/i3jmx5/whats_up_with_the_reddit_april_fools_2007/

This is about doublethink (a process of indoctrination in which subjects are expected to simultaneously accept two conflicting beliefs as truth) as a method for controlling your memories, to also be able to manually forget something, then to forget about forgetting. Doubleplusgood (the word that replaced Oldspeak words meaning "superlatively good", such as excellent, fabulous, and fantastic) is part of Newspeak, which is the method for controlling thought through language. Newspeak has gained ground steadily, all Party members tending to use Newspeak words and grammatical construction more and more in their everyday speech.