A cabbie is the person who drives a taxicab. The words step on it, when used to discuss driving or travel, mean that you want to go faster.
告訴計程車司機開快點兒。
口語中，有人管出租汽車司機叫 cabbie (亦作 babby)。而片語 step on it 相當於美語口語 step on the gas (踩油門；加速) 的意思。