Theory, being a left shooter coming from the right:

1) Pull the RS to the right
2) Bring the RS back a little
3) Hold L1 (LB X360)
4) Move LS to the left
5) Move the RS to the left (this will send the puck to the left)

Once you hit and hold the L1 button the RS controlls where the puck will go and the LS where the player goes, so there's a lot of fun to be had with L1-dekes.