That one guy who stole the name Luffy from the anime and puts shame on the character is the definition of this word.
Me: I don't like you, Why don't you understand?
Luffy: Hi mamas, I love you
Me: Luffy, You're retarded.
Used to describe something that is interesting, unique, or super cool.
Man, I wasn't sure about this JRE podcast, but once Joe put on those retarded sunglasses I was all in!
Some people say that it means slow but i think it means stupid as hell
Dude you are so friggin retarded get up and lets go