It's a nonsense
word. On their variety show, Run BTS, the BTS members were playing a game like telephone, where you have to read your teammates lips while wearing headphones that are blasting music. J-Hope was trying to mouth the
word "carbonara" to Jimin, who read the now infamous
word, LACHIMOLALA, to the final player,
Jin. Despite getting the wrong "message" Jin saved the day with his genius ways and got the right, answer, "carbonara," to everyone's surprise.