가장 친하고 소중한 친구를 일컫는 말로, 'best friend forever'의 줄임말.
An abbreviation for 'best friend forever,' used to describe a person's closest and most trusted companion.
예문:
"She's been my BFF since we were five years old."
"I need to call my BFF and tell her the big news."
"They are total BFFs and do everything together."