ПОД ГАЗОМ slangPrepPInvarsubj-compl with copula (subj: human or obj-compl with видеть кого etcobj: human)) one is in a state of intoxication (more often, mild)
tight
tipsyunder the influence.
(Авдонин:) Побежал я, короче говоря, в контору. Комнату просить. Очень плохо соображал... (Третий коммунист:) Под газом? (Авдонин:) Какой - под газом! Рано утром (Салынский 1). (А.:).. .То put it briefly, I ran to the office to ask for a room. I hardly knew what I was doing.... (Third communist:) Were you tight? (A.:) I wasn't tight at all. It was early in the morning (1a).