I’m 40, and it’s interesting to see how slang has evolved in my lifetime.
To cite words that have come is easy: “Whateverrr,” “issues,” “LOL,” etc.
To cite words that have gone is also easy: “Groovy,” etc.
But then there are the subtle cases, such as when a word used to be used more than it is now.
I think maybe “dick” is one of those. It’s still used in the sense of “penis” and “jerk,” but it just seems less possible. For penis, “cock” (which is not new, of course) seems much more prevalent. People still say, “He’s being a dick,” but I think “asshole” (which again is not a new word) has become more popular.
The only time I really use the word is to describe some asshole-y thing that someone did. Like “That was really a dick move.” When talking about a penis, I would say either penis or wiener. Wiener sounds funnier.
I use “dick” and “cock” interchangeably (when referring to a penis). And if the OP is only 40, how is he remembering “groovy”? that was gone by the time he was born.