Poo Ass Nigga

Commonly used in Internet memes and real life.
It is an insult to say to someone if you are losing an argument or just to ruin someone's life. It is also just to say for comedic effect in a conversation or out of the blue.

A poo ass nigga is when someone smells like absolute buttwhole and refuses to take showers, not only that, they spray an absurd amount of axe body spray and wear the same pair of underwear for more than a week