Some people have the tendency to use words in a context similar to a pronoun, despite the word in question being an adjective, verb, whatever. Examples would be someone like Agent K in the film "Men in Black", who often referred to his junior agent "J" in such a way:
- Whatever, slick, but let me tell you something.
- It's your show, chief.
An historical example would be the hippy sub-culture of 1960's and 1970's America, which often used the expression "man" in this way.
- It's looooove, man. Love sets you free.
Another example from that same time period would be the "Greaser" sub-culture, which used the proper name "Jack".
- Don't be a square, Jack. Just ride.
In American English, what is the proper term for using words this way? I initially thought "nickname", but that's more of an individual thing. This use seems rather global and generalized.