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1.
A unit of volume in the imperial measurement system. Typically used for measuring amounts of liquid to be sold. Rarely used in scientific or any usefull application.
I got 10 gallons of root beer for 5 bucks!
by berkinator July 18, 2005
 
2.
slang for gasoline, it goes low gallon(regular)first, then high gallon(plus) then super high gallon(premium). for diesel, we use "the german gallon"
you pull up to a full-service station, and the guy asks,"would you like the high gallon or the low gallon?
by thebug October 29, 2006
 
3.
the amount of alcohol that 1SG can drink......homeboy! HOOAH!
Cadet: Ever do drugs 1SG?
1SG: Hell no! I don't do drugs.....but i do drink alot of booze! I can drink gallons homeboy!!! HOOAH!