Ignit is a shortened version if ignited. Often it is used in a self reflective and unformal speak, or when abbreviations are often common. For example during video games, or tense situations.
An Ignit is an ignorant fuckin bloodsucker. It is a synonym of Neomort as an insult. This Phrase was coined by Sir Roman of Lynfield in the year of our Lord 2023
You're a fucking Ignit, Jennifer That Old Man, what an ignit. He keeps stealing our apples.
Comes from tabletop games and other games that use dice in combat mechanics. Generally, when a big fight is about to go down, players will "roll for initiative" and whoever gets the higher roll gets to gofirst.
So, "roll for initiative" can be used as an (intentionally nerdy) synonym for "initiate a fight".