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.

Of Thoughts From The Porcelain Throne – Becoming The Muse

porcelain throne – Have Wind Will Travel

Culture Shock! And The Porcelain Throne

Men and Their Porcelain Throne. Women's point of view., by Aakriti Hiteshi

porcelain throne – Have Wind Will Travel

Top 10 Auckland names for the toilet - NZ Herald

dad one who masters sleep keeper of the porcelain throne and teller of the best dad jokes see also go ask mom Father's day - FridayStuff

Vintage Laufen Nautilus Regal Lion Porcelain Throne Toilet Water Closet, Cistern at 1stDibs

Porcelain Throne, Emma Murf

This Thor Hammer Toilet Paper Holder Is Meant For Those That Sit Upon The Porcelain Throne

Need For Speed Undercover: Downloads/Addons/Mods - Cars - Porcelain Throne (Toilet Car) for Undercover

Game of Thrones Fans Can Turn Their Toilets Into The Iron Throne With Decals