when your calves are too big to fit any sort of pair of boots, no matter what.
-"I can't get these rain boots on"
-"Why not?"
-"I have FCS...fat calf syndrome."
A condition where you have excess skin after a drastic weight loss, like Fat Bastard had when he lost all that weight in the Austin Powers movie.
“Looks like you lost over 100 pounds. Congratulations! But look at all of that excess skin!”
“I know, I got Fat Bastard Syndrome. Getting surgery to remove all of it.”