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The crazy people who worship SB19 like it's the end of the world. They call themselves a'tin because they think they own the group and they yell it like a war cry.
@a'tin_forever You're not a'tin until you scream it in the shower.
Why are you crying? You're a'tin! You should be happy!
If you don't know who SB19 is, you're not a'tin. You're just a sad person.