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Dead serious.
EVEN MORE SPOILERS
He was the product of the incest between his mother and his grandfather. His mother married his suposed father already pregnant. She claimed he treated her badly, so she had no better idea to get rid of him than get thirteen years old Flyboy in bed with her and her husband to see them. The hubby commited suicide, Flyboy understandably lost it and got commited to a hospital, from where I think he was recently out when the movie started, from what he told Clay.

serious?
"..and I mean that from the heart of my bottom.."

He's traumatized by not only the death of his father but also the "relationship" with his mother. I also kind of thought maybe it was a genetic condition, seeing as he is his own uncle.