| Noun | 1. | fast one - a cunning or deceitful action or device; "he played a trick on me"; "he pulled a fast one and got away with it"gimmick, twist, device - any clever (deceptive) maneuver; "he would stoop to any device to win a point" schtick, schtik, shtick, shtik - (Yiddish) a devious trick; a bit of cheating; "how did you ever fall for a shtik like that?" | |