As with any era, the 1920's had time period specific slang. Here is a sampling. It sure is the berries! Have a swell time, but make sure you don't upchuck!
Bell Polisher—A young man addicted to lingering in vestibules at 1 a.m.
Brush Ape—Anyone from the sticks; a country Jake.
Duck’s Quack—The best thing ever.
Face Stretcher—Old maid who tries to look younger. .
Fire Extinguisher—A chaperone.
Flatwheeler—Slat shy of money; takes girls to free affairs.
Gimlet—A chronic bore.
Grubber—One who always borrows cigarettes.
Potato—A young man shy of brains.
Ritzy Burg—Not classy.
Rug Hopper—Young man who never takes a girl out. A parlor hound.
Sharpshooter—One who spends much and dances well.
Slimp—Cheapskate or “one way guy”.
Tomato—A young woman shy of brains.
Trotzky (sic)—Old lady with a moustache and chin whiskers.
Bee's Knees - An extraordinary person, thing, idea
Berries - is attractive or pleasing; similar to bee's knees, As in "It's the berries."
Big Cheese - The most important or influential person. Same as big shot
Bluenose - An excessively puritanical person, a prude
Bump Off - To murder
Carry a Torch - To have a crush on someone
Cat's Meow - Something splendid or stylish; similar to bee's knees; The best or greatest
Cat's Pajamas - Same as cat's meow
Cheaters - Eyeglasses
Crush - An infatuation
Dogs - feet
Drugstore Cowboy - a guy that hangs around on a street corner trying to pick up girls
Dumb Dora - a stupid female
Fall Guy - victim of a frame
Flat Tire - A dull insipid, disappointing date. Same as pill, pickle, drag, rag, oilcan
Frame - To give false evidence, to set up someone
Gams - A woman's legs
Giggle Water - An intoxicating beverage; alcohol
Gin Mill - An establishment where hard liquor is sold; bar
Hard Boiled - a tough, strong guy
Heebie-Jeebies - The jitters
Hooch - Bootleg liquor
Hoofer - Dancer
Hotsy-Totsy - Pleasing
Jalopy - Old car
Joint - A club, usually selling alcohol
Keen - Attractive or appealing
Kisser - Mouth
Lounge Lizard - a guy that is sexually active
Moll - A gangster's girl
Neck - Kissing with passion
Pinch - To arrest
Pushover - A person easily convinced or seduced
Ritzy - Elegant (from the hotel)
Scram - Ask someone to leave immediately
Sheba - A woman with sex appeal (from the movie Queen of Sheba)
Sheik - A man with sex appeal (from the Valentino movies)
Speakeasy - An illicit bar selling bootleg liquor
Spiffy - An elegant appearance
Struggle Buggy - the backseat of a car. A parent's worst nightmare
Stuck On - Having a crush on
Swanky - Ritzy
Swell - Wonderful. Also: a rich man
Take for a Ride -To drive off with someone in order to bump them off
Torpedo - A hired gun
Upchuck - To vomit when one has drunk too much
Whoopee - To have a good time
The editors of Who's Who In Filmland 1931 included a glossary of the “newest slang for 1931:
Classiest Mammas in town: Smartest women in town.
He's phooey/He's crackers/He's blooey: He's mad.
A dim bulb/A banana/A sap/An oil can/A sucker/A dumb-bell: A fool.
The parrot's cracker/The bunk/Boloney: Nonsense.
Okay: All right.
A cap pistol/A cannon/A gat/A rod/ A shooting iron: A revolver.
A weisenheimer: A smart fellow.
Punk-hoofer: Bad dancer.
Peeved up: Annoyed.
Roll over: Stop talking nonsense.
The Homicide Squad: A police department dealing exclusively with murder cases.
To tie on the nose bag: To have a meal.
Ditch that rod: Put that pistol in your pocket.
Sugar daddies: Men who "protect" girls.
Shoot: Go on with what you have to say.
Automat: A cheap restaurant where the clients help themselves to dishes from a kind of slot machine.
Right through the old pump: Right through the heart.
Gimme a drag on that weed: Give me a puff at that cigarette.