poloneck Share definition Flag A high, snug fitting cylindrical collar on a skivvy ( long sleeve T-shirt ) or sweater.Worn by women, action heroes and nerds. 1. For the winter fashion show, some models wore poloneck sweaters.2. The day turned cold, so she pulled on a poloneck.3. Wincing when she saw the hickey on her neck in the mirror, she thought, " Looks like I'll be needing a poloneck today. " poloneck by Ceea June 20, 2009 Get the poloneck mug.