The term "on the gas" is to used to describe a person or persons who are currently or have been, drinking alcohol.
Dave: "Hey man, what did you get up too in the weekend?"
Mike: "Oh, me and a few mates when down to the local bar and got on the gas, Saturday night."
Dave: "So, a quiet one on Sunday then?"
Mike: "Yep, you could say that."
The starting pitcher gave up a run in the 6th inning, giving the other team the lead. The relief pitcher came in and threw gas on the fire, giving up more hits and walks, and eventually a run.
An expression (traced to the skateboarding community of the early 1990's in Syracuse, NY) expressing the possession of particularly unattractive facial features.