I'm so grateful for my adolescent clients who keep me hip and privy to current topics. A client came in recently and said "I'm worried I'm my friend's DUFF." My puzzled look told her I had no idea what this meant. She went on to explain that it stands for Designated Ugly Fat Friend. [cringe]
"Friend" is clearly a pretty loose term if you're being designated as such, and especially if you're being labeled and judged as ugly and fat. This isn't how friends treat each other.
And it's certainly not a reason to try and change your appearance. You are beautiful the way you are. The things that make you different are what makes you special. Embrace this. Celebrate it. And make new friends who appreciate your uniqueness.