Combination of "promo code" and "no more" (i.e., no mo'), describing the act of trying what you think is a valid promo code for an online purchase—but it fails at checkout. There just ain't no mo' code.
The refusal, from the Man withoutnarcissism camouflaged as a Woman in red, to nut in white women anymore after having participated in such an act before, because theyve had their fill.