The 'F' in "BFG" does actually stand for the swear word in the original design docs, but the documentation included with the game calls it "Fragging". I guess it's apt to say that one term is more official, while the other is more colloquial.
As I mentioned in the video, the various source ports are usually better to play than the originals, but I wanted to quickly point out that virtually all of the source ports need nothing more than the WAD files to run properly, which means they work with more recent releases such as the Steam release. ;)
Found this out over a year after this episode went live, but For those of you who have Doom without the Ultimate Doom upgrade, there's actually a free patch which brings Doom 1.9 up to The Ultimate Doom! The actual patch file is "19_udpat.exe" and while there's a number of places you could grab this from, just in case you're not already updated to v1.9 you can find all the Doom patches here: http://www.gamers.org/pub/games/idgames/idstuff/doom/
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