Istagib 

This word was first borne with Unreal Tournament. One of the powerups that this game has includes a Shock Rifle that kills the enemy with one shot, no matter where it's hit. To Istagib, basically, means to kill with one single blow your opponent. Eventually used in Online Games.

Don't aggro those mobs, they'll istagib u since u r lv 5 and they're lv 14.

Istagib by Kenjitheninja December 14, 2006

Instagib 

Stands for Instant Giblets, referring to one-hit kills in FPS games where the victim is instantly turned into 'giblets', or explodes.

Originated in Quake II and made popular in Unreal Tournament.

I took out my instagib rifle and limbs started flying when I started gibbing all around.

Instagib by Zopiac April 12, 2009

instagib 

Online Gaming Term.

1) A players health is such that upon being killed in a multiplayer game they explode into many gibs and giblets (peices of simulated flesh and gore). (Quake 1)

2) A game mode where every weapon (usually only a hitscan railgun/ASMD) instantly kills the player in one shot. (Started in Quake 2 and popularised as a mutator in Unreal Tournament)

3) Finding yourself at the bottom of a chasm/lava/force field and being instantly turned into gibs when you touch the bottom.

I was playng instagib the other day when I totally owned some guys when they lined up and I instagib'ed 4 people in a row!

So I was running around and a spammed a rocket into a door and it slapped this poor sucker in the face. I then jumped off the top of the level and instagibbed him with my railgun as I was falling. Dont think he had time to blink!

instagib by MessyCorpse February 8, 2009

instagib 

An action whereby a person can be killed in a single hit in Unreal Tournament.

God damn it I hate fucking instagib, turn it off!

instagib by teknokracy July 28, 2003

instagibbed 

Stands for Instant Giblets, referring to one-hit kills in FPS games where the victim is instantly turned into 'giblets', or explodes.

Originated in Quake II and made popular in Unreal Tournament.

I took out my instagibbed rifle and limbs started flying when I started gibbing all around.

instagibbed by TheJackMann June 21, 2014

Instagib 

The act of being killed exceeding quickly. Standardly 1 shot. But in games lacking an 'instagib rifle' (or even anything resembling a gun) is usually taken to mean death in <1-2 seconds.

Unreal: The server had instagib enabled last night. Twas so chaotic my head was reeling after a few rounds.

Battlefield: That guy killed me as soon as I turned the corner.

Defense Of The Ancients: Care man, they will instagib you if you go too far alone.

Instagib by Anno-Mus September 17, 2010