To enter these cheats your character needs to pull off a 100+ 
trick combo succesfully. (The best way to do this is to go to 
the Boardwalk and grind a table near the Hot Dog Stand, then 
press Space and B alternately and rapidly.) 
Then, at the start of a level, during the flyby (Sunny and Eric
will be talking) type in any of these cheats to get the effect.
(Does not need to be capitalized) You can only have ONE cheat 
activated at a time.

Code         Effect
-------------------
NOFAIR     - All Cheats
KABOING    - Higher Ollies
SLOWMO     - Infinite Mollases Time (More Time in the Air)
DIZZY      - Infinite Spin Cycle (Spin Around Faster)