>>715751886As in too much time-wasting, filler, or otherwise unwanted content that spreads the parts you're playing for out more than you'd want. Another word for it would be bloat.
Funnily enough, a game can also have too much 'good' content. If you stack a game too much or make it run too long despite it all being what you wanted in the first place, it's going to get old sooner or later. Pacing and temperance are very important.