Definition

An utterly bizarre phrase meaning to smell bad or emit an unpleasant odor. The etymology is mysterious and possibly nonexistent, making it one of those phrases that sounds like it was invented by someone having a fever dream. Nobody knows why wagons are wet or what that has to do with smelling bad, but here we are.

Example Usage

Dude, your gym bag has the wet wagons—when's the last time you washed those clothes?

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=wet%20wagons&defid=28)