Shag/ʃæɡ/ Definition 1 of 6Pro Tip 1/2Winter Garments Often used to describe heavy coats or jackets ideal for cold weather. I need to buy a shag coat for the snowy season. Pro Tip 2/2Retro Home Decor Associated with 70s style interiors; may seem outdated or vintage now. Their house has a retro vibe, complete with shag carpet.