Porcelain Throne - What does porcelain throne mean?

Porcelain Throne is slang for "Toilet." See an example of how people use it.
A porcelain throne is a fancy name for a toilet. It comes from the porcelain material used to make toilets and the royal seat a king or queen sits on.

Porcelain Throne

Poetry in the Toilet. A poem for all who sit on the porcelain…, by R. du Plessis, The Lark

Game of Porcelain Thrones : r/meme

The Witch's Toilet

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Culture Shock! And The Porcelain Throne

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Culture Shock! And The Porcelain Throne

Porcelain Throne