Lachimolala
It's a dumb word Jimin made up during a game where he couldn't hear anything. It's just nonsense, but now it's super famous.
"Lachimolala? That’s the worst!", @BTS_Fan
Jimin: "I made it up, it’s perfect!", @BTS_Jimin
My little brother says Lachimolala is his favorite word, @Lachimolala_Kid