Sonic Project X is a porn video tag referring to a specific adult film featuring characters or elements from the popular Sonic the Hedgehog franchise. The term "Sonic" refers to the main character, Sonic the Hedgehog, and "Project X" could represent an unofficial or fan-made production based on or inspired by the original franchise. This type of adult content combines erotic elements with themes and characters from the popular video game series for the enjoyment of fans who are also interested in explicit material