Off the perc

Either when someone is on the prescription opiate "Percocet" (also known as Oxycodone, Oxycontin, and Oxys), or when someone is acting unnecessarily retarded for no reason.

Example 1: Yo he off da perc, he can't even speak
Example 2: "Why did daequan beat the shit out of that old woman?" "idk man he was off the perc