I use this stitch to create an increase in the row without increasing the stitch count of the row.
This is helps to close up spaces in between double crochet stitches. These spaces can be extremely noticeable when working with thread as I frequently do.
So, it is very handy to use this stitch when crocheting smaller things like fashion doll clothes and accessories, or where you would rather work double crochet stitches and not worry about having large wholes in the garment.
Simple Bobble of 2 Stitch Instructions:
leaving the last lp of each dc on hook - work 2 dc into same st, yo, pull through 3 rem lps
Full Written Instruction of this Stitch:
(yo, insert hook into st, yo, pull through st, yo, pull through 2 lps) rep into same st, yo, pull through 3 rem lps on hook