Hi and welcome to Knitting Help.
I checked in the Glossary, just in case I was remembering wrong, and it says SS means slip stitch. Five rows of just slipping stitches makes no sense, which is why I checked. Is there something, somewhere in your pattern that tells you what it means? Sometimes things like that are well hidden. What is it you're making, can you link to the pattern or at least tell us a name?