This is not a SFW instance. NSFW communities will be tagged, and efforts will be made to keep SFW communities clean, but proceed at your own comfort level.
Over 9000 is a popular catchphrase derived from the Japanese manga anime series Dragon Ball Z, typically used as an innumerable quantifier to describe a la
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Nice xD
It pops up in programmer humor from time to time, but with the original wording xD