1. noun /ɡiːk/
a) A carnival performer specializing in bizarre and unappetizing behavior.
I once saw a geek bite the head off a live chicken.
b) A person who is intensely interested in a particular field or hobby and usually antisocial. Often used with an attributive noun.
I was a complete computer geek in high school, but I get out a lot more now.
2. verb /ɡiːk/
To get high on cocaine.
Wikipedia foundation.