Insult, originating from the anime Digimon. Each season of the show contained a stubborn or bullheaded "leader" character who wore goggles on top of his head. The word "gogglehead" came to epitomise the
stereotypical blunt, stubborn, or
self-centered characteristics of the show's main characters.
Despite the fact the Digimon show has been over and done with for some time, it still has a pretty hardcore fanbase, and the word is common on website and forums that still cater to Digimon fans, as well as other "kiddie anime" sites that host pages about Pokémon, YuGiOh, or other shows that shared a fanbase with Digimon.
Often used affectionately.