He got completely gassed after inhaling too much gasoline smell while fixing the car in the garage.

gassed 是动词 gas 的过去分词形式，gas 本意是"气体、汽油"，在这里引申为"因吸入气体而头晕"的意思。gassed 表示"因吸入气体而变得昏沉"的状态。