Any long pants made of material, that are comfy and will keep you warm during extended game play. May include but is not confined to: pajamas, trousers, hippy pants, underwear, and trackies.
Person 1: "Dude, how cold was it last night!"
Person 2: "Yeah I was up playing Halo till 3, good thing I had my gamer pants on!"
An adult diaper specifically designed for video gamers, allowing them to play for several hours without interruption.
I'm gonna wear my gamer pants for tonight's raid, I can't wait to down this boss.