Gamerjargon. A term used to describe something or someone who has ascended to a higher dimension through sheer willpower, going a step above Sicko Mode.
When you or something is suddenly on point as fuck. You / whatever you are referring to is on the next plane of existence / ballerdom. The urban equivalent of going super saiyan.
1: My new kicks are nigga mode.
2: James went straight nigga mode on those flapjacks.
3: Lebron went straight Nigga Mode on Durant last night.
4: Guy A: Dude I think I created a new genre of music.
Nigga mode means every tyoe of adrenaline related feelings and actions.
Example: anger, excitement, being a crazy bitch and attacking your friends, running around, jumping, uncontrollable sadness, and such, summing it up: every extreme emotion.
Bro, (name) drank so much yesterday he went nigga mode! He started jumping on the table fucking with every thing in the house!