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Was that seat hot or what? I feel like a Whopper. Turn me over, I’m done and ready. I’m afraid to look at my ass. There’ll be grill marks.
— Del · Planes, Trains & Automobiles

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker jokes that a scorching seat has cooked him like a fast-food burger, asking to be flipped because he's done. His fear of looking at his backside for grill marks is pure comic exaggeration about how hot the seat was.
Context reviewed