"SSX Tricky is a snowboarding video game, the second game in the SSX series published by EA Sports BIG & developed by EA Canada. In SSX, players choose one of several varied characters, participate in races or trick competitions, and earn rewards. The game's sequels are SSX 3, SSX on Tour, and SSX Blur.
SSX Tricky introduces "Über Tricks," exaggerated tricks that take longer to complete, and often involving detaching the board from the rider's feet. The player gains access to Über tricks after filling the adrenaline bar by doing other, non-Über tricks. If the trick is successfully landed, a small clip from Run-D.M.C.'s "It's Tricky" plays, hence the game's name. Performing six Über tricks earns the player unlimited boost for the remainder of the course.
It is also possible to push down another rider using the right analog stick in the PS2 and Xbox versions, and the C-Stick in the GameCube version, which results in instant filling of the adrenaline bar. The other riders' attitude toward the player (a bar displayed at the end of each race showing in percent how much the other riders hate or like the player), however, will change, causing the attacked character to act more aggressively toward the player in future races."
Source: Wikipedia, "Ssx_tricky," available under the CC-BY-SA License.