Use 'bum around' in casual conversations, not in formal or professional settings. On weekends, I love to bum around in my pajamas.
Pro Tip 2/3
Negative Connotation
'Bum around' often implies laziness or a lack of drive, so be careful using it to describe others. My roommate is always bumming around instead of studying.
Pro Tip 3/3
Implied Choice
Suggests a person chooses to be idle, rather than being forced into inactivity. She could be working on her project, but she's bumming around instead.