To me, this means asking the following: when you do something, do you feel guilty after? Do you hate yourself for playing 5 hours of video games every night when you know you could be productive? That's a guilt-laden activity.
For some, the video games might not even be games they particularly enjoy—just grindy/addictive games that have a superior numbing effect or sense of progress.
It's probably safe to say there's a large overlap with procrastination.