"I must have been smoking dust last night, because I thought we were fine those first couple of days." A line from author Juno Diaz, in his book "This is How You Lose Her"
Going faster than someone else, particularly in some sort of formal or informal competition ; in driving, running or walking. As in "leave in the dust".
He was running at a good pace and I was a little behind him, but when we got to the hill I dusted him. I never saw him again.