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1920's Slang
All Wet - Describes an erroneous idea or individual, as in, "he's all wet." 

Applesauce - An explative; same as horsefeathers, As in "Ah applesauce!" 

Bee's Knees - An extraordinary person, thing, idea; the ultimate. 

Berries - That which is attractive or pleasing; similar to bee's knees, As in "It's the berries." 

Big Cheese - The most important or influential person; boss. Same as big shot. 

Blind Date - going out with someone you do not know 

Bluenose - An excessively puritanical person, a prude, Creator of "the Blue Nozzle Curse." 

Bump Off - To murder, To kill. 

Cake-Eater - An effete ladies' man, or someone who attends tea parties. 

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, wonderful. 

Cat's Pajamas - Same as cat's meow. 

Cheaters - Eyeglasses. 

Crush - An infatuation. 

Darb - An excellent person or thing (as in "the Darb" - a person with money who can be relied on to pay
 the check). 

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. 

Flapper - A stylish, brash, hedonistic young woman with short skirts and shorter hair. 

Flat Tire - A dull witted, 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. 

High-Hat - To snub. 

Hooch - Bootleg liquor 

Hoofer - Dancer. 

Horsefeathers - An explative; same usage as applesauce. 

Hotsy-Totsy - Pleasing. 

Jake - OK, as in, "Everything is Jake." 

Jalopy - Old car. 

Joint - A club, usually selling alcohol. 

Keen - Attractive or appealing. 

Kisser - Mouth. 

Line - Insincere flattery. 

Lounge Lizard - A guy that is sexually active. 

Moll - A gangster's girl. 

Neck - Kissing with passion. 

Ossified - A drunk person. 

Pet - Same as neck, but more so. 

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 move Queen of Sheba) or (e.g. Clara Bow). 

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.


Directly quoted from:
http://www.geocities.com/MotorCity/Lane/6341/History/slang.html

Car Slang:
Jitney - A private cab 

Dog - A troublesome car

Tin Lizzie or Fliver - A Model T Ford 

Stove Bolt Six - A Chevrolet 

Steady Breaker - A Studebaker

Wag -  A joker or humorist.


EFM stands for Every Morning Fixum 
EFM (Evert Metzger Flanders) became part of Studebaker


Source:
http://www.roaring-twenties.com/roaring_twenties24.htm