40 

Adjective; forty ounces of malt liquor.

I'm goin' down to the stop n' rob, n' pickup a 40.

40 by TYSON R. May 11, 2008

40 

A popular firearms caliber.
.40SW (Smith and Wesson).
Powerful and compact, it is the choice caliber of law enforement and criminals alike.

"Aint no nigga try'a messin with ma 40 cal, by smit n' wessin'"

40 by .357ROB September 30, 2003

40 

a number that follows 39

39 + 1= 40 and that is the end of the story

40 by Tina Fey November 17, 2006

40 

40 ounces of life's best source.....beer.

Get me a 40 of coors

40 by Big Smoke Dogg November 25, 2003

40 

40 oz. of beer. Usually of a low quality and makes you instant white trash when you drink said bottle

Judy, get me a 40 bitch.

40 by ducttape16 March 29, 2003

40 

The minimum age to be called an old person.

congratulations. your now 40 years old.

40 by Jake Robinson December 28, 2005

40 

A number derived by typing in the word "nigga" into a ti-83+ calculator and pressing enter.it can be used to by white people to say "nigga" when it is unsafe to say nigga as to say when black people are around.

"You know what Joe you's a 40!"

40 by Borak July 12, 2006