|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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Simison Steaming Stout was a brand of dark beer which presumably emitted smoke. The label featured a picture of a steam engine.
"Steaming" is a British slang term meaning "extremely drunk."
- Harry Potter and the Prisoner of Azkaban (film) (First appearance)