A type of tight-fitting knitted thermal underwear.
2000, Genevieve Rowles, Adventure Guide to MontanaBring your snuggies when visiting Yellowstone Country in any season. Just because it's July doesn't mean you can leave your longjohns, sweatshirts and windbreakers at home.
1971, Robert Deane Pharr, S.R.ONot because of her totally fleshless legs, but because she was wearing red snuggies when it was actually pretty hot weather. Lina partly lowered the snuggies and extracted a quart of Spur.
1960, Ann Abelson, The little conquerorsHilda said, "Wait, you don't mind, I want to pick up a few pairs of snuggies, it's getting miserably cold, I won't have to come back ..."