What does BFG mean?
The general consensus is that BFG stands for Big Fragging Gun. Well, that’s the G-rated version at least. Hank Leukart’s Official Doom FAQ (the one that ships with the game) says so. So is “Fragging” a deliberate softening of another famous F-word? Maybe. But the term “frag” is an actual word, and it’s used in Doom to represent a confirmed kill in a deathmatch game. This comes from the idea that in a deathmatch, you are killing your fellow space marines.