A way to say goodbye to somebody you don't expect to see again (in this lifetime).
Can be used positively, with emphasis on the prospect of seeing them again, albeit in another lifetime.
Also can be used negatively, with emphasis on the implication that you won't be seeing them again THIS lifetime.
Derived from the catchphrase of the character
Desmond on the TV show LOST, who would frequently say, "
I'll see ya
in another life, brother"
Soldier 1 (wounded and dying): I don't think I'm gonna make it, man...
Soldier 2:
Hang in there, buddy,
I'm right here.
Soldier 1: I see the light... I'm going towards it...
Soldier 2 (crying): I'll see you
in another life, man. Say hi to my brother for me.
Guy 1: Dude, come on, we've been best friends for 6 years, you can't seriously be THAT mad about me sleeping with your girl.
Guy 2: Yeah... you can fuck off. See you in another life, man.