Best Toilet Service (BTS)

Real full form of BTS

Sigma: What is the full form of BTS?

BTSfan: It’s Bangtan Sonyeondan!
Sigma: No, it’s not….
BTSfan: Huh? Then what’s the real full form of BTS?
Sigma: Best Toilet Service (BTS)

BTSfan: 😭😭😭😭