L.D.B.L.
A dirty, lazy way to say see you later that means you're leaving and you hope they never see you again.
L. D. B. L. I'm gone. I hope you never see me again.
L. D. B. L. I'm out. I don't want to see you again.
L. D. B. L. I'm leaving. Don't come back. I don't want to see you.