Gib is when an enemy explodes into a bunch of little pieces. Not sure how you do it in this game. --- "I'm no hero. Never was, never will be. I'm just an old killer, hired to do some wet work." Old Snake in Metal Gear Solid 4: Guns of the Patriots
There are grenades, underbarrel grenades, and environmental items like fire extinguishers and oxygen tanks that explode.
Also, you can shoot the pods with the face-huggers in them and the pods explode. I'll see if I can shoot one with a hugger in it, and if that counts as gibbing. --- "Nazeem is Skyrim's most successful troll." - StarDestroyer Hail HYDRA!
xeno explode easy with grenades or any given explosive attachment. --- build a man a fire and he will be warm for a day, but set a man on fire and he'll be warm for the rest of his life. Baka wa shinanakya naoranai.
There's a section you get a smartgun. You'll get it then pretty much guaranteed. --- FX6100, HD7970, 8G DDR3 1600, 750G/400/1T SATA2/3, 700W, Logitech G5/G510, Win7 XPS16 - i7 720QM, 6G DDR3@1333, 500G SATA, HD4670 1G, Win7
A Gib has been an accepted term for blowing something up in a cloud of blood and guts pretty much since FPS games have existed, so if its called having a life I would suggest yours has been lived in ignorance.