Gamefoof 

–adjective, gamefoof⋅er, gamefoof⋅ster Slang.
ridiculous; silly; wacky; nutty: a goofy video game playing style.

–noun, Slang.
a person who randomly shirks serious video gaming for fun and enjoyment; a video gamer with intense facial expression while playing, either to poke fun or to create a serious gaming mood

Sentence construction: "Stop acting so gamefoof! We need to finish this level!"

Gamefoof by Unbotchable November 22, 2009

GameFool 

A person who is the BEST gamer to ever exist. Most people hate them and become jealous of them or impersonate them on the net.

Whoa did you see that guy kick that other guy's ass in Street Fighter? Wow, what a GameFool!

GameFool by www.dumbasses-anonymous.cjb.net July 19, 2003