The phrase refers to a type of disguise worn during the Halloween season that embodies mythical or fantastical marine creatures. These ensembles typically feature elements such as scales, fins, tentacles, and vibrant colors associated with ocean-dwelling beasts. An example includes a full-body suit adorned with green and blue fabric, complete with a large headpiece shaped like a monstrous fish.
Such thematic attire offers a unique and imaginative alternative to more traditional Halloween characters. It allows individuals to express creativity and stand out during celebratory events. Historically, the concept draws upon maritime folklore and legendary accounts of fearsome aquatic beings, providing a connection to age-old narratives and the enduring fascination with the unknown depths of the ocean. The selection of such a disguise can be an engaging avenue for exploring mythological and artistic expression.