look up any word, like kappa:
 
1.
Beer or malt liquor which has a high alcohol volume is said to be "High Gravity" .

Examples are Steel Reserve and St. Ide's.
I'm running up to Rite-Aid to grab a 40 of High Gravity.
by 211 March 17, 2004
 
2.
A beer that has more alcohol in it, and is responsible for me making a urinal out of my dresser drawer.
"Dude, why is my dresser drawer all wet?! ....damn that high gravity!"
by PongChamp September 20, 2008