I don't think I've ever met a self-described "business guy" who wasn't a student.

If someone is a great salesman, they are a "sales guy". If they write ads, they are a "marketing guy". If they allocate capital, hire and fire, and lobby the CEO for more funds they are "managers".

When people say "business", it means they don't know what they are able to do, but want to make money. Or that they want to be the manager, but don't want to say it.