I'm a big Chris Rossi fan. When Rossi has written about it, he refers to the right arm while going from 1-ball to 2-ball as the "trailing arm" (and vice versa).
On a related note, "toe side/heel side" makes sense in wake-boarding, insofar as your feet are actually turned sideways on your board. Meanwhile, on a slalom ski both feet are pretty much pointing forward, so using "toe side" or "heel side" just seems goofy to me. "Offside" and "onside" have been used for decades, and... c'mon man... not everything in our sport needs the BNG treatment.
As always, IMO.