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To put gasoline into a vehicle. A noun or pronoun can be used between "gas" and "up." You should gas up before hitting the road—you'll never make it all the way there otherwise.
gas something up
to put gasoline into a vehicle. I have to gas this car up soon. I will stop and gas up the car at the next little town.
to fill up one's gasoline tank with gasoline. I have to stop at the next service station and gas up. The next time you gas up, try some of the gasoline with alcohol in it.
Sl. intoxicated. Fred is gassed up and very wobbly. He was too gassed up to drive home.
Supply a vehicle with gasoline, as in I want to be sure to gas up before we go. James M. Cain used this term in The Postman Always Rings Twice (1934): "I went to gas up a car." [Colloquial; c. 1930 Also see tank up.
1. To supply gasoline or fuel to a vehicle: The tank was almost empty, so we stopped at a service station and gassed up.
2. To supply some vehicle or machine with gasoline or fuel: We gassed up the car before the road trip. After fixing the lawn mower, I gassed it up and tried to start it.
mod. alcohol or drug intoxicated. Fred is gassed up and very wobbly.
See gassed up