The story's fucking great. It takes such a backseat to the collection of scenes that it took me forever to internalize it, too.
Gord wants to be an animator, so he moves from Portland, Oregon to Los Angeles, California to work at a cheese sandwich factory. He shows his drawings to studio head Dave Davidson, who tells him he needs to practice more. So Gord moves back to Portland and lives with his parents. He starts dating a girl in a wheelchair, who eventually achieves her dream of making a rocket powered wheelchair. This inspires him, so he moves back to Los Angeles to try again. This time, he succeeds and gets a million dollar check. Which he then spends on jewels, a helicopter ride, and a plan to drug his father and transport half his house to Pakistan. They're both captured and held hostage, then return home after 18 months, where the movie ends.
Of course, that makes it sound like a normal movie. What actually happens are various Tom Green gags. Which I find hysterically funny. Ranging from genuinely good slapstick to demented scenes from hell, FGF has everything.
By the way, the movie swept the Razzies. Tom Green showed up in a limo, rolled out his own red carpet, and played kazoo onstage until they physically dragged him off.
Maybe it's because I grew up in the era where every person on the internet called it the worst movie ever (not even close), but I fell in love when I watched it. One gag I always love on a rewatch is how normal Gord looks for the first few scenes in the film. I think around the first time he gets to LA, they puff up his eye bags and darken his eyes so he looks like an insane man that hasn't slept.