The word geek is a slang word. It has many different meanings. It can mean a person who enjoys computers and knows a lot about them. It used to mean a carnival worker "who bit the heads off of chickens and rats." One dictionary says that a geek is "a peculiar or otherwise dislikable person, especially one who is perceived to be overly intellectual". This means "a strange and un-likeable person, especially one who is thought to be very clever", in simple English.