This method of binding off was popularized by Grumperina on her blog, “Grumperina goes to local yarn shops and Home Depot.”
Work 2 sts in pattern (move yarn to back if last stitch was a purl). * Transfer the 2 worked sts to the left-hand needle, and k2tog TBL. Work 1 st in pattern (move yarn to back if stitch was a purl). Repeat from *.
See Binding Off for more stretchy bind-offs.