A geek is someone who has an advanced knowledge and interest of the video game universe and/or the internet trends. A gamer can seem like the same thing, but in fact, the gamer is only invested in his own games and has little to no knowledge regarding others types of gaming platforms. Not to be confused either with the nerd who is great at school and well implicated in his studies and the pursuit of a big career.
Christophe is a geek even though he claims that he's only a gamer.
Christophe is in denial that he is a pure geek.
Someone who does not enjoy being outside and would rather spend their time reading comics and playing video games. Not to be confused with nerds, not all geeks are smart. Some can be dumb and or average. Most geeks have a very big knowledge base of fiction.
Geek 1: Oh my god did you hear they're turning Captain America into a Hydra agent?
Geek 2: Yeah *pursues to rant on how Marvel is basically running out of ideas*
I wrote an article discussing how to define geek: www.geekwishlists.com/geekdefinition
When I was growing up I used to geek out over Star Wars.
Describing a person that has an high amount of intelligence with an exception with being annoying or weird.
"I don't like Jeremy, he's a geek"
"He's the teacher's favorite student, since he's a geek"