A nickname for the holographic decoy armor ability in the Halo Reach video game. The holla-nigga is a simple minded hologram that runs off in a single direction, often getting hung up on architectural structures such as doorway or columns. Holla-niggaz can be very effective in drawing fire away from the player sending it out.
Shit! I just went after another holla-nigga.
I thought you were going to kille me 'till I saw you go after the holla-nigga I laid down.
What's up with all these motherfukkin' holla-niggaz?