The place God sends people who want for nothing and are still cruel. Not to be confused with the Last as in the last shall be first. No, they want for nothing and care for nothing and that is what they are and what they will get. Jesus is tired when he gets to them and says, "some other time".
The end-of-the-line is behind The Last. See that definition. The people who in the last days had it all and wouldn't share. The-end-of-the-line is for mean people. That is where they will go, to the end of the line.