Gibbing, deriving from the word "giblets" meaning the offal of a dead animal, is a video gaming slang term featuring prominently in many 3D shooter games.
The word refers instances when a game character has been killed with such force that their body explodes leaving their "giblets" visible all over the floor.
It is where you cant stop talking and blurting out sayings from the SNL skit "The Barry Gibb Talk Show" which is a great parody of the brothers Barry and Robin Gibb of the Doobie Bros. (aka Jimmy Fallon and Justin Timberlake)
Blurting out "aaaagghhhh" and "Do you have anything to aaaad" in a shreiking voice like Barry Gibb! Out of nowhere I pulled a Gibbisms in the bar when I talked to that chick!