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A bottle containing 40 fluid ounces of malt liquor beer. The beer is of low quality and fairly cheap to buy. A bottle can run you usually between 2 and three dollars depending on brand. 40's are popular in a variety of areas and are drunken by many types of people. Gangstas will drink 40's and will sometimes pour out a little of the beer onto the ground for their dead homies. Teenagers also like to drink 40's because it is a fast way to get drunk and all the beer is in one bottle opposed to drinking several smaller 12 ounce bottles and/or cans. Some brands of beer produced in the 40 ounce variety are Clot 45, Olde English, Mickey's, and King Cobra.
"Pass me that 40 motherfucka!"

"I'm gonna pick up some 40's for tonight."
by IceWarm June 22, 2004
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2
Derogatory slang for mall security guards/vehicles. Derived from 5-0, a slang term for police officers/vehicles.
The 4-0 got on my ass after I boosted that Clay Aiken CD from Sam Goody.
by Sam March 04, 2004
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3
A bottle containing forty fluid ounces of beer, ale, malt liquor, distilled urine, etc... Usually costs under 3 bucks and is the equivalent of about 3 1/3 standard size (12 fl/oz.) cans or bottles of beer.

What you drink when you wanna get but all the money you have was change found in your couch and/or car.
I once paid under two dollars for 40 ounces of malt liquor, it was the worst libation I had ever consumed, but I got pissy drunk.
by sextypething December 15, 2003
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4
The temperature at which the Celcius and Fahrenheit scales are equivalent. From this point the two scales diverge with 5 degrees Celcius equalling 9 degrees Fahrenheit.

Also very cold.
It was - 40 yesterday, I damn near froze my balls off.
by monkey40 July 26, 2009
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5
A Bachelor of Health Sciences Student at McMaster University in Hamilton, Ontario, Canada.

Currently resides in Mary E. Keyes Residence.

His ideals are reflected by his relentless pursuit of a perfect GPA: a 4.0, so to speak.

The man would give up anything and everything for a 4.0, including all extracurricular endeavors and sex life (or lack thereof).
When asked "How would you like to go on a date with me?"

4.0 answered, "I'm sorry, I cannot do that since I must focus on my studies."
by Tripse 4.0 February 01, 2010
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6
40oz of any alcoholic beverage. Colt 45, King Cobra, English 800, all example of popular 40oz.
Ya tuned a spanging job into a life long career
For a tin of tabacco and a 40 of beer
-Leftover Crack
by Andrew Apocalypse March 26, 2005
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7
A forty-ounce beer used by cheap people or those looking for a quick high
Let's get this party started
Let's keep them 40's poppin
Let's just get buzzed and stay f'ed up

We'll keep them panties droppin
by tbag112ftfw April 12, 2010
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