I came up with this one with a specific person in mind but decorum prevents me from going any further than that this is a perfect description for him.
Toolio - someone who thinks they are supercool but they're really a supertool.
Which, of course, leads to another related term...
Foolio - someone who thinks they are supercool but they're really a superfool.
Tags: toolio, foolio, fictionarium, new words, inventing language, NWotD