quake II's "big f* gun" (fill in your favorite f-word), originally found in doom. DuvalMagic's Weapon FAQ and the BFG FAQ describe how the new QII BFG works. see history of the BFG
(Jargon Rating= 9) Bioengineered Fraternal Gargantuan. Located in Roald Dahls head. Unlikely to be used in ski engineering but would look funny going down a mountain.