Picture -- Movie

Backside Turn.

Some examples.

A back side 180, you would be turning toe side.

if you did a front side 50-50, you would be looking at the ground below the curb and if you did a backside 180 out of that 50-50, your nose would have turned away from the curb, going forwards and not backward, your front would now be facing the curb with you riding along fakie.

If you skate regular (Left foot on nose, Right on tail) it is a right 180

If you skate goofy (Left foot on tail, Right on nose) it is a left 180