Is there any teen comedy more influential than Mean Girls ? This movie came out in 2004, and we are still celebrating it to this day. Mean Girls is timeless, and it seems to understand what it's like to be a teenager far better than most movies of any era. The quotability of the movie sends it over the edge from simply iconic to full-blown legendary status. You go, Glenn Coco; Stop trying to make fetch happen; That's why her hair is so big, it's full of secrets; I'm a mouse, duh; Get in, loser,…