The phrase denotes creative concepts for Halloween costumes that incorporate a wagon as a central element. These ideas often involve transforming the wagon into a themed vehicle or setting, enhancing the overall costume presentation. For example, a child dressed as Dorothy from The Wizard of Oz might be pulled in a wagon decorated to resemble the house swept away by the tornado.
The appeal of such costuming lies in its practicality and visual impact. Wagons provide a convenient means of transporting children, especially those too young or tired to walk long distances during trick-or-treating. Furthermore, the addition of a decorated wagon elevates the costume from a simple individual portrayal to a more elaborate and memorable scene, capturing attention and potentially enhancing the festive atmosphere.