1. To be swindled out of money.
2. To sell items to raise money for a cause but pocket what is earned.
3. To be the subject of reporting on a social networking site as a matter of spite or vengeance.
That chick said she was raising money for St. Judes but then she totally greened everyone.
Man, I totally got greened when I sold my Jeep!
That guy greened me on Facebook because I slept with his girlfriend!