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Stands for, "Best Friends For Life And In Heaven With Jesus." Really good friends. Simple as that.
If you are against religion, you can say "Best Friend For Life And In Hell With Judas." Same basic definition of "Really Good Friends."
"Dude, she is my BFFLAIHWJ."
"Will you be my BFFLAIHWJ please?"
by Japanese Gangster Warrior. May 15, 2009