No matter how you personally define "fat" or if your definition of fat isn't the same as anyone else's,
What causes you to FEEL fat?
For me, feeling fat has very little to do with how much I weigh. I felt fat at 145 (in high school), I felt fat at 256lbs (my all time high) and every weight in between. It's such a roller coaster of emotions. Some days I'm elated and happy with the way I look and other days I'm disgusted.
Today I'm disgusted. I weigh exactly what I weighed yesterday. My clothes fit the same. Yesterday I felt fit and trim and sexy. Today I woke up, looked in the mirror and just felt FAT! All I could see were stretch marks, sagging skin, and jiggly bits.
I wish I understood why some days I just feel fat...