A painful condition caused by leaning foward while sitting on a couch for a prolonged period of time. Normally comes from playing games such as Mario Kart Wii and any NFS game, where you play Wi-Fi for too long or get in a long pursuit. The remedy is simple, stop playing, stand up, (if you can) stretch, and if you have to, take off your pants.
Other conditions that may accompany gamer's waist include; Gamer's Thumb- Painful, red, possibly concave mark on your thumb. Gamer's Wrist/Gamer's Hand- A cramp that comes from holding a controller the wrong way, the feeling may remain for the entire day. Gamer's Flashback Syndrome- When you close your eyes you can still see the game, comes from playing late at night. And finally, Gamer's Foot- What happens when you play Cod4 for extended periods of time, especially during Wi-Fi matches.