Yes, but the x axis is the direction of motion.
I would say that when you roll out of a moving car, you’re doing a barrell roll. It would certainly involve rolling over your tucked-in shoulder, which I think is different than a somersault (forward roll), or a cartwheel (sideways with hands).
Man, you guys deconstruct the fun out of everything. 
HA! That one’s even funnier than the barrel roll one.