Very dumb people, names like omary and omar are 99% retarded all the time
"wow did you see that omar kid he's such a retarded person"
"yeah i agree"
Although less common can be used as slang for describing incomprehensible genius.
“Yo Devon Townsend is straight up retarded.”
“Yo the entire Alien album is fully retarded.”
Isaac says “Adil, if you look up the definiton of Retarded. Adil would come up.”
Adil replied “Oh really, let me look up what retarded means.”
Someone who is ignorant or stupid
Alexis and gracie are retarded for adding someone back on snap they didn't know and received a dick pic