ultratard
An annoying person who thinks they are an intellectual genius, but in reality are extremely unintelligent. An ultratard will always jump into the middle of conversations and spout out useless and incorrect information. They will speak loudly when talking to one person so bystanders will be sure to hear their idiotic ramblings.
I asked him a question and he gave me a 10 minute answer that made absolutely no sense. He is a real ultratard.