BTS

It means Bangtan Seonyeondan, or Bulletproof Boyscouts, not behind-the-scenes.
Person 1: Yo, do you know BTS?

Person 2: No. Ohh, you mean behind-the-scenes?
Person 1: No you dumbass, the biggest boy band in the world.
by yoongiz ♡ November 02, 2021
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