Kool.
Sweet.
"Dude" has also had an impressive run
Kewl.
Steve McQueen.
Quewl.
Real cool daddy-o
Tender.
Über-cool...
Nuthin' "cooler" than ice, dontcha know ...
Word.
Cool's wide range of meaning other than the opposite of warm has mostly a positive connotation--pleasantly amusing, not angry. And that is cool.
But the top slang word of the 20th century has to be gay, which is seldom used anymore to mean the opposite of sad. Now gay is sometimes used as a mild pejoritive. And that is cool.
Hawt.
I grew up during the 60's and wouldn't have been caught using the word 'groovy'. That would have been tantamount to using the Lord's name in vain.
But I do enjoy using 'groovy' around children. They think its hysterical!
Dude, that was an excellent post.
From: http://www.miskatonic.org/slang.html
Here is some hardboiled slang...
A
Alderman: A man's pot belly.
Ameche: Telephone
Ankle:
(n) Woman
(v) To walk
B
Babe: Woman
Baby: A person, can be said to either a man or a woman
Bangtails: Racehorses
Barber: Talk
Baumes rush: Senator Caleb H. Baumes sponsored a New York law (the Baumes Law) which called for automatic life imprisonment of any criminal convicted more than three times. Some criminals would move to a state that didn't have this law in order to avoid its penalty should they be caught again, and this was known as a "Baumes rush," because of the similarity to "bum's rush."
Be on the nut, To: To be broke
Bean-shooter: Gun
Beezer: Nose
Behind the eight-ball: In a difficult position, in a tight spot
Bent cars: Stolen cars
Berries: Dollars
Big house: Jail
Big one, The: Death
Big sleep, The: Death (coined by Chandler)
Bim: Woman
Bindle
of heroin: Little folded-up piece of paper (with heroin inside)
the bundle (or "brindle") in which a hobo carries all his worldy possessions
Bindle punk, bindle stiff: Chronic wanderers; itinerant misfits, criminals, migratory harvest workers, and lumber jacks. Called so because they carried a "bindle." George and Lenny in Of Mice and Men are bindle stiffs.
Bing: Jailhouse talk for solitary confinement, hence "crazy"
Bird: Man
Bit: Prison sentence
Blip off: To kill
Blow: Leave
Blow one down: Kill someone
Blower: Telephone
Bo: Pal, buster, fellow, as in "Hey, bo"
Boiler: Car
Boob: Dumb guy
Boozehound: Drunkard
Bop: To kill
Box:
A safe
A bar
Box job: A safecracking
Brace (somebody): Grab, shake up
Bracelets: Handcuffs
Break it up: Stop that, quit the nonsense
Breeze: To leave, go; also breeze off: get lost
Broad: Woman
Broderick, The: A thorough beating
Bruno: Tough guy, enforcer
Bucket: Car
Bulge, as in "The kid had the bulge there": The advantage
Bulls: Plainclothes railroad cops; uniformed police; prison guards
Bum's rush, To get the: To be kicked out
Bump: Kill
Bump gums: To talk about nothing worthwhile
Bump off: Kill; also, bump-off: a killing
Buncoing some (people): Defrauding people
Bunk:
"Take a bunk" - leave, disappear
"That's the bunk" - that's false, untrue
"to bunk" - to sleep
Bunny, as in "Don't be a bunny": Don't be stupid
Burn powder: Fire a gun
Bus: Big car
Butter and egg man: The money man, the man with the bankroll, a yokel who comes to town to blow a big wad in nightclubs (see reference)
Button: Face, nose, end of jaw
Button man: Professional killer
Buttons: Police
Butts: Cigarettes
Buy a drink: To pour a drink
Buzz, as in "I'm in the dump an hour and the house copper gives me the buzz": Looks me up, comes to my door
Buzzer: Policeman's badge
More at http://www.miskatonic.org/slang.html
Slap my ass and call me Suzy.
It may be because "Groovy", "hip", "far out" are expressions of enthusiasm; they have to be shouted, or have an exclamatiom mark, or something. Whereas "cool" is, well, just cool.