Stands for "Fuck You Go Die." Used in a variety of situations, always accompanied with a flip of the bird (that is, your middle finger) and a scowl. Often said between well-meaning friends for humor value, but can still be used in a hostile way.
Wow man, I can't believe you hooked up with my girl while I was out of town. FYGD!
by Ash The Heretic December 10, 2009