So this particular topic was devoted to the STi, I take it? And by virtue of naming it "uh oh" in Scooby Doo-ese, it was a mistake? 
Rut Ro is something I say when one of the following occurred:
1. Cooked a corner
2. Hooked up with a street race worthy car at a traffic light.
3. Passed a cop well above the posted speed limit.
4. Laid a patch of rubber at a random launch.
Most the above would be preceded by Ree hee hee hee.