BFG 

The Big Fucking Gun (or more politely, Big Freaking/Fragging Gun) found officially in all of the high-profile id Software games like Doom and Quake. Fires a very large green ball of man-made lightning and then upon impact, the weapon instantly releases a huge spread of energy to anyone that the BFG'er is facing. (Despite how extensive this definition is, it is loose.) In Quake II, the ball of energy will shoot lasers a certain distance for some additional pain.
Newbies hate the weapon, but some veterans consider the BFG a thinking man's weapon (in deathmatch)because of its strange behavior, slow firing rate, and high energy drain.

Grasshopper couldn't hide from ShadowFox's BFG.
Neo was disintegrated by Bar3Star's BFG.

BFG by prdarkfox May 5, 2005

bfg 

Stands for 'Big Fucking Gun'. A powerful weapon in the Doom and Quake series.

"Gots my BFG set on 'toastifry'.."

bfg by Mad Walrus August 6, 2002

BFG 

people who relentlessly party and go out and work towards/achieve nothing in their life. They end up being complete nobodies in the real world but are too blinded by it because they think partying and going out is what matters in life

I am working the 9-5 job in my hometown and I achieved nothing in my life because I was bfg in my younger years.

BFG by Greatness$#% February 19, 2023

BFG 

the BFG9000 was the most powerful weapon in the doom video games. it originally stood for "Big Fucking Gun" as explained in the game's design document. the quake games pay tribute to the gun with the BFG10k. in the recent doom motion picture, the gun is denominised on a computer screen as "Bio Force Gun".

"the BFG is the key weapon in doom's final level"

BFG by noodlemantra April 19, 2006

BFG 

Kids: Big Friendly Giant

Teens and up: Big Fucking Gun, from Doom series

eat this fucker!!

BFG by Whale Watcher June 5, 2003

BFG 

big fucking gun such as in DooM and Quake, and some various mods for other games.

Sucks in Quake 3

Arwing should have used a smaller gun

BFG by arwing September 28, 2003

BFG 

Kids: Big Friendly Giant
Teens and Over: Big Fucking Gun
Tall Gingers: Big Friendly Ginger

Kids: Mummy the BFG is on the telly
Teen: Fucking Hell, look at that BFG
Tall Gingers: I'm the BFG!

BFG by DM214 April 12, 2007