Uberposeur
Someone who so completely falls under the spell of Harley Davidson Corporate brainwashing that they constantly are purchasing only Officially Licensed Harley Davidson products, getting HD tattoos because they look cool, and incessantly spouting off nonsense about how Harley Davidson bikes are the only motorcycle worth owning.
Cosmo is such an uberposeur that he just purchased yet another Harley that is going to sit in his heated storage unit collecting dust between weekly polishings. For the amount of money he has thrown at Harley Davidson he could have bought a new house.