NANCY MCDONALD-KNWRTHY wrote:
"Best Friends Forever" from a South Park tv show episode:
The abbreviation is older than that episode, which aired in March 2005, though: Cyber bullies stalking online playground. Candy J. Cooper The Record (Bergen County, N.J.) Apr. 21, 2004 10:45 AM "Conflict escalates quickly online, where facial expression and voice intonation are replaced by "jk," for just kidding, or "lol," for laughing out loud. Matters are complicated when two "bff's," or best friends forever in cyber-slang, share one another's passwords, as girls often do. When the falling-out comes, they can wreak havoc by sending damaging messages everywhere - with their new enemy's name attached. " I have no idea how much older it might be than that.