It's a slur. Please don't use this if you are not neurodivergent!
Meghan: Wow, that's kinda retarded, isn't it?
Sam: You know you really shouldn't say that. Just say stupid or idiotic.
What soda is generally called in Georgia (and in some other parts of the south)
Texan: Hey, do you want a coke?
Georgian: Sure, what kind do you have?
Texan: .....Coke?