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1.
a fifth of a gallon, or 4/5 quart: approx 750 ml.
i drank a fifth of 151 lastnight, i think...
by andrew December 09, 2003
 
2.
750 ml, enough to get any man wasted, unlike an eigth/pint which the some of the above people have mistaken to be a fifth, which is about 16 oz which is what youd be seeing people sipping off of. then theres the good old handle which is 1.75 liters
drinking dip spit didnt seem like a bad idea after drinking a fifth of vodka
 
3.
By definition a fifth of alcohol Is 750mL. A fifth means a fifth of a gallon.
Ludacris - "I drank a fifth of gin", in reality a fifth of alcohol would knock anyone on their butt.
by Jestur March 18, 2006
 
4.
a measure of alcohol purported by countless high school boys to be an easy night's drinking
High school boy: Man, I got so wasted last night ... I drank over a fifth of Jack!

Realistic guy: Yeah right, you big-mouthed high school fuck. Enough with the big dick stories.
by collegesucks2001 December 08, 2003
 
5.
A one fifth of a gallon bottle of alcohol, or 4/5 of a quart. Previous to the US converting to the metric system, hard liquor was sold in 1/5 gallon bottles. Slightly larger than the current 750ml, but still used to refer to a 750ml of booze
Pick me up a fifth of Jim Beam.
by CK454 December 30, 2008
 
6.
A fifth is a US measurement of alcohol equivalent to 25.6 shots; 25.6 ounces; 1.6 pints; 0.8 quarts; 0.75706 liters.
After 26 shots of tequila, Craig had consumed about a fifth of alcohol.
by Hemitheos February 03, 2008
 
7.
Not 1750ml. It's 750ml. a 1750ml bottle is usally called a 1.75
by Anonymous April 15, 2003