An aerodymanical feature that 'spoils' the air flow by forcing any air that reaches it into the shape, pushing the rear end of the vehicle downwards, this is used to improve handling and to increase downforce.
Information that could spoil the experience of a certain game, may that be a console game or a PC game. Spoilers usually come woth warnings to stop people who havent seen the whole game yet, to prevent them seeing the information before they discover it themselfs.
Holy hell when i got up to 100 MPH my Evo started to get some upforce, i need to get myself a spoiler!
Dahm, on the Atari forums someone revealed a spoiler and I havent started the game yet!