Is is American English skateboarding
slang for performing well -- what is known in automobile
slang as "firing on all cylinders", in tennis
slang as "being in the zone", or perhaps in martial arts as having "mind, body, and soul" in harmony.
"I couldn't believe it when he landed that
720 heelflip coming off the half-
pipe and went straight back down again - he was really gleaming the cube
today!"