A busybody is a nosy, meddling person, who’s very interested in what other people say and do. If you’re a busybody, you can’t help offering advice to friends, whether they want it or not.
Busybodies are known for trying to help with situations in which they’re not necessarily welcome or needed. You could describe your mom as a busybody if she asks prying questions and tries to orchestrate your romantic life. The word busybody comes from a now-obsolete meaning of busy, “prying” or “meddlesome.”