No facial definition, puffy chubby face. What can be done?

It's hard to envision your situation without photos.  If you are young liposuction of the cheeks and neck can be beneficial.  If you are over 45 you may need a facelift.

 It is impossible to answer your question without seeing pictures of your face. Otherwise I am just guessing as to what treatment would be best. Make sure you see a very experienced facial plastic surgeon  or plastic surgeon for this.

You may be a candidate for buccal fat pad removal to highlight your cheekbones and flatten your lower rounded cheek region.  This works especially well for people who have always had rounded cheeks whether they were heavy or thin.  Meet with an ABPS Bd Certified plastic surgeon to be evaluated for that procedure and possible filler or fat injection to highlight your facial bony structure.  Enjoy your results!Jon A Perlman MD FACSCertified, Am Bd of Plastic SurgeryMember, Am. Society of Aesthetic Plastic Surgeons (ASAPS)Beverly Hills, CA