"Pool's Closed" meme started when people from 4chan, YTMND, Bantown, and Ebaumsworld raided a popular online community game called Habbo Hotel. All the raiders dressed their habbos as black characters with afros wearing business suits called "Nigras." What they would do is that they would invade every room (espically the Pool Deck) and block the entrances and the pools so no one can get in. They repeatedly say "The pool is closed due to AIDS." Don't ask me where the whole AIDS thing came from because I don't have a damn clue.