In video games you can do two things: complete the mission or roam around the level checking out all the nooks and crannies and plan on completing the mission at some point but for now you're just exploring. It now applies to young people who do not have a definite direction but are exploring different jobs and looking for a career or a niche in life. It can be a sad time in a young person's life.
Matt is still on the walkabout. He's gonna be 28 and has no idea what he wants to do, too bad he majored in art history.