An American who takes Bill O'Reilly seriously.
These faggits usually also listen to nonsense like rap, a genre of music which shouldn't even be called music.
Charles: "Have you heard? Someone in our crib watches the Bill O'Reilly show?"
John: "Yeh, they're our new amerifagneighbors who just moved in"
Amerifag: "BILL FTW!1! one eleven!"
Amerifags feed on hamburgers and other red meats and are impossible to distinguish from potatoes.
"Why is that fat man eating a ball of raw meat?"
"Oh, he's just an amerifag."