However, here are some slang words that are less commonly used than they once were:
1950s & 1960s:
* Groovy: This word was used to describe something cool or fashionable.
* Far out: Similar to groovy, meaning amazing or impressive.
* Square: Used to describe someone who is old-fashioned or uncool.
* Go with the flow: Meaning to be flexible and adapt to situations.
* Beatnik: A person who belonged to a countercultural movement in the 1950s and 1960s.
1970s & 1980s:
* Rad: Meaning cool or excellent.
* Totally: Used to emphasize a statement or opinion.
* Bodacious: Another word for fantastic or excellent.
* Dork: A word for a foolish or awkward person.
* Gag me with a spoon: An expression of disgust or disapproval.
1990s & 2000s:
* Psych! Used to reveal a prank or joke.
* Wannabe: A person who imitates or tries to be someone else.
* Gnarly: Meaning impressive or awesome, particularly in skateboarding or surfing.
* Boing! A word used to express surprise or excitement.
* Kick it: Meaning to relax or hang out.
Keep in mind:
* Some of these words might still be used in certain contexts or by specific age groups.
* New slang words are constantly emerging, making it hard to keep track of what's "in" and what's "out."
It's more accurate to say that these words are less frequently used in mainstream language than they were in the past.