No - he meant fish tailing - as in a 'tank-slapper', when you accelerate hard out of a corner and the car goes into a power oversteer slide, so you overcorrect and the tail goes the other way, and overcorrect again and the tail goes back the other way, in the manner of a swimming fish...
Fair point on the Gameshark though - I think he meant that he could, using the Gameshark, build grotesquely overpowered cars that fishtail madly when accelerating out of corners...