So Erik has a Playstation 2 and he plays football, hockey, or golf on there from time to time. Matthew has a controller too that he plays with. He has a blast playing (or pretending to play anyway). These sports games are all made by EA Sports so when they first come on you hear their slogan "EA sports, it's in the game".
So every time Matthew sees one of these games or sports on tv he repeats what he believes the slogan to be "EA sports a silly game".