1. To put gasoline into a vehicle, especially to fill the tank to capacity. You should gas up before hitting the road.
2. slang To drink alcohol to the point of intoxication. The guys are down at the bar gassing up before the game.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mod. alcohol or drug intoxicated. Fred is gassed up and very wobbly.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.