DBG is short for "Dumb Business Guy" which is a term used by computer programmers to describe their, bosses, managers, team leaders, co-coordinators or project managers. They use this term because as programmers they have absolutely no idea how the business works or what the need to be done to make sure there is work for them to do each day. They assume the "Suits" just have meeting, send emails and go out for lunch all day.
Programmer: What are the DBG's doing today?
Co-Worker: Probably a meeting, then lunch, send a few emails, another meeting, then call it a day.