Watermelon flavor vape is a type of e-juice or vape juice that is designed to provide a watermelon-like taste experience when used with a vaporizer or e-cigarette. This flavor is usually made from a combination of food-grade flavorings, propylene glycol, and/or vegetable glycerin, which are combined to create a liquid that can be heated and vaporized for inhalation.

It's worth noting that not all watermelon flavor vapes are created equal, and the quality of the flavor and the vaping experience can vary greatly depending on the ingredients used, the manufacturing process, and the quality of the vaping device used. Some watermelon flavor vapes may contain high levels of nicotine, while others may be nicotine-free.