Having similarity to the most publicized Tourette Syndrome "Coprolalia", the phrases uttered by a gamer with GTS do not necessarily reflect the thoughts or opinions of the person.
Example: The house is quiet and the roommate is playing a video game while wearing his headphones so he wouldn't disturb the other people in the house
In the living room:
Gamer: (out loud) "F*******CK!!!"
At the dining table:
Non-Gamer 1 (Guest): (startled) what? what just happened?
Non-Gamer 2: "oh it's nothing, he just have Gamer's Tourette Syndrome (GTS) when he plays his video games."