The phrase "___ has had work done" means that a person has gotten cosmetic surgery. Cosmetic surgery is a kind of surgery that a person gets to make themself look better. Some examples of cosmetic surgery include:
- a face lift (reducing wrinkles in the face by pulling the skin tighter
- liposuction (getting fat removed)
- a "boob job" (breast enlargement)
You can gossip about someone's cosmetic surgery by saying that they've "had work done" or just "had work":
Do you think she's had work done?
Look at his face. He's definitely had work.
This phrase is a little rude, though, so you usually wouldn't use it when talking directly to the person who got cosmetic surgery.