It just means to slip the stitch without purling it, but slip it as if you were going to purl it (rather than knit it). It will give you a more even edge since you're only working these stitches on the knit side.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry