This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. superlative form of soapy: most soapy.

"In the soapiest of twists, the series hints that Spartacus may have impregnated Glaber's wife Ilithyia, whom he was forced to bed — for her social entertainment — back in his slave days."