Defatting the nasal tip entails very carefully thinning some of the underlying soft tissue in the nasal tip. This must be done with extreme caution to prevent inadvertent compromise of the blood circulation to the nasal tip which can be detrimental. Please consult with a board certified specialist in rhinoplasty who can assist you with achieving the results you seek. 3-dimensional computer imaging can help you visualize what you may look like afterwards.
Defatting of the nasal tip can reduce the thick appearance of the tip however this can be a dangerous maneuver.