Noun
(UK, education, uncountable) Structured play activities for young schoolchildren during inclement weather.
You should stay in since it's wet play.
(geology, countable) A natural gas formation containing wet gas, meaning it has sizable amounts of liquid alkanes such as ethane, propane, and butane.
(sexuality, psychology) Sexual activity involving liquids; either urolagnia or sploshing (wet and messy fetishism).
Source: en.wiktionary.org