A st8tepoo is when you land a trick with at least a 6 foot drop, and the impact upon landing nearly forces your bowels to release feces into your pants.
Me- "Did you see Tavis land that kickflip off those 7 stairs?"
August - "Yeah I did! From the look of his face I'd say he had a Sk8tepoo."
Me- "I'll never look at him the same way."