"Chunky yarn" refers to a type of thick and bulky yarn that is used for making cozy and warm items like scarves, blankets, or sweaters. Full definition
This cozy - looking scarf is made using chunky yarn and a fun stitch that ends up looking like little puff balls. (12thblog.com)
This is a thick, chunky yarn in a cotton candy pink color. (geekwrapped.com)
I have long been a fan of these super chunky yarns also known as «rovings» They are very popular on Instagram too, I have seen them made up into large throws for your sofa or cosy snuggly blankets for your bed. (lazydaisyjones.com)