OWOOT
From Stunts Wiki
OWOOT stands for "One wheel on/over track", and is a rule for certain competitions. The rule means that you cannot make shortcuts, which makes for a totally different, cleaner and more perfectionistic races. The expression and the rule were first developed by Ruepel and Pershing II who made the ISA competition with this rule in 2002. There is one general exception to the OWOOT rule: the grass square in the middle of a jump.