Simply lead with your anus.
Used to be called switch or "switch stance" by skaters and snowboarders but now the skiers have coined a new term as in….
"Look at that skier going anal in that video!!"
"He just did an anal to anal 1080 bro, gay."
So skiers can have do anal spin? Yup. It could even be called an "Anus to Anus 360"
Even when skiers are not going backwards down the hill, it could be said hay are going "reverse anal"

see S.A.S.S.
Snowboarders Against Stupid Skiers (SASS)

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