The phrase "giganticbeast" in the context of porn video tags typically refers to a scene that involves a large or massive body size or an extraordinary endowment, usually related to the male performer. This can be interpreted as both literal and metaphorical. For example, it could refer to a man who is very tall, muscular, or has an exceptionally large penis (often referred to as "BBW" for Big Black Weapon). The tag may also be used to describe a scene that involves unconventional or fantastical elements, such as mythical creatures or giant humans. It's essential to remember that the porn industry caters to various kinks and fetishes, and this particular tag represents one of those niches.