General Slang:
* Groovy: Popular in the 1960s and 1970s, meaning cool or excellent.
* Far out: Another 1960s term, meaning amazing or incredible.
* Rad: Popular in the 1980s, meaning cool or awesome.
* Wicked: Used in the 1980s and 1990s, meaning cool or awesome.
* Bodacious: A 1990s slang term meaning great or excellent.
* Gag me with a spoon: A 1990s expression meaning "that's disgusting."
* All that and a bag of chips: A 1980s-1990s expression meaning "very good" or "great."
* The bomb: A 1990s expression meaning excellent or great.
Internet Slang:
* LOL: Laughing Out Loud. This is still used, but it's often considered overused and less meaningful.
* BRB: Be Right Back. This is still used, but less frequently than in the early days of online communication.
* OMG: Oh My God. While still widely used, it's less common in formal communication.
Keep in mind:
* Regional variations: Slang can be very regional. A word considered obsolete in one area may still be common in another.
* Revivals: Some slang terms can make a comeback, though they may be used differently than before.
* Evolution: New slang words are constantly being created, making some older words obsolete.
It's important to remember that the line between "obsolete" and "still used" can be blurry. A word may be less common now, but still used by certain groups or in specific contexts.