The full form of BFG is The Big Friendly Giant.
The BFG is a beloved character and title from Roald Dahl's 1982 children's novel, which tells the story of a young girl named Sophie who befriends a gentle giant known as the BFG. The BFG is different from the other giants in Giant Country, as he is kind and refuses to eat humans. Instead, he catches dreams and delivers them to children. The novel has been adapted into films, further popularizing the BFG character and the meaning behind his name.