"To hold a controller" means to physically grasp and utilize a handheld device that allows a person to interact with and control a video game or electronic device. Full definition
Now you can play games without even holding a controller in your hand. (lifewire.com)
It's pure videogame stuff except you don't get to hold a controller with a pause button. (parentpreviews.com)
The controls are actually as simple as they come, by holding the controller horizontal and using both hands rather then the usual one. (darkstation.com)