On gigga 

A combination of “On god” and “Nigga”
(second definition: on everything)
Slang used mostly around Dallas Texas which originated in Coppell Texas by Aidan Goodson.

Person 1: Aye you tryna go smoke a blunt real quick?
Person 2: Shiii I’m finna sit down n smoke a pound and dats On gigga

On gigga by Yung Renzo October 27, 2019

On Gigga 

Slang Term Created By Sebastian Aranza & Anthony R (Tha Goat Of Boppell AKA Prophecy). A Mix of "On God" and "Nigga". If You Say It, It Means You Speaking Real Shit.

FAXX NO PRINTER DAS ON GIGGA

On Gigga by prophecy da spitta November 17, 2019