The term 'FAST ONE' can be used to describe a variety of different things, from a joke or quip to a SCAM or FRAUD. The crossword solutions for this term include HOAX (4 letters), SCAM (4 letters), HARE (4 letters), PLOY (4 letters), PULLA (5 letters), FRAUD (5 letters), TRICK (5 letters), QUIPPER (7 letters), RACECAR (7 letters), SWINDLE (7 letters), FLIMFLAM (8 letters), SPEEDSTER (9 letters), BLUESTREAK (10 letters), and DIRTYTRICK (10 letters). All of these words refer to something that is done quickly, often with the intention of deceiving or taking advantage of someone. HOAX, SCAM, FRAUD, TRICK, SWINDLE, and FLIMFLAM are all terms used to describe fraudulent activities, while HARE, PLOY, PULLA, QUIPPER, RACECAR, SPEEDSTER, BLUESTREAK, and DIRTYTRICK are all words that refer to something that is done quickly or with speed.