Spins the selected edges in their winding direction, changing their connectivity 1 vertex at a time. Edges must be attached to only 2 faces in order to be spun.
If you spin an edge multiple times, Maya edits the offset attribute of the existing history node. Spinning an edge does not affect the vertex IDs or edge IDs, however as you spin an edge, the adjacent faces rotate along with it.
Note: You can access Flip/Spin Edge from the marking menu by clicking 
+ 
when the polygon is in Edge mode.
+ when the polygon is in Edge mode.