From the album cowboy cologne
This is about staying stuck because you have already decided home does not want you back. The narrator keeps inventing reasons not to go while the dog ages and the cologne memory fades, because admitting you miss a place you ruined is harder than pretending it holds nothing anymore.
Corpsed on the floorboards / Begging it to spin slow
The narrator is lying completely still but time keeps moving. Using 'corpsed' as a verb turns paralysis into an active choice, which is the whole problem.
And I miss home / And that's embarrassing 'cause I still live so close
The embarrassment is not about distance. It is about missing a version of home that does not exist anymore or maybe never did. Living close makes the loss more obvious.
The warmth of plastic parts / Softening my weary feeling
Pressing into a steering wheel until the plastic warms up is a gesture of someone who does not know where to drive. The car is not going anywhere.
And I won't go / Because there's nothing left for me there anymore
The dog is still there. The dog is something. The narrator is redefining 'nothing' to mean 'nothing that will forgive me' or 'nothing I have not already lost.' They know this is a lie.
If I can't see the lines meet / And I can't see the lines meet
Perspective lines are supposed to converge at a vanishing point. If they do not, you have lost depth perception or the ability to see a future. This might be literal depression vision or it might be metaphor. Either way, the repetition is someone trying to convince themselves the problem is optical.
The song never says who wore the cologne or what happened to make home unbearable. That absence is the point. By the end, the narrator is stuck in a car or on a floor, unable to see lines meet, which means they cannot see a way forward or back. The dog is still aging.