A snuggie is a blanket with sleeves
The blanket is usually made of fleece fabric, or something else that is nice and warm. You can attract it as a kind of jacket, so you can sit and lie down on the couch without getting cold. Other denominations are snuggy, Snuggler, slenderness and Doojo.
Get on your Snuggie [YouTube] 0Ym65h1bmJ0 [/youtube]
Images of Snuggies