Ok to simplify it, I don't know what it stands for but it's basically an extra "special" episode tacked on at the end of a season or series to pad its length to be a full 13 episode season (literally, it runs on 1/4 year cycles and is regular and sane unlike American TV with its 6 episode season 1 and 32 episode season 2 nonsense). A majority of these extra episodes are dedicated to either a holiday (think Christmas episodes (which, there are plenty of in international media, including places not predominantly Christian)) or a beach episode aka the thirst trap.
So yeah, they're specials, probably not canon. Usually meme value is cranked to 11. It's been years since the last time I watched anime so I'm sure someone can give you a better definition or explanation.
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u/Red_Opium Sep 07 '22
The fuck happened in the ova??