turtleneck

noun3

1. •
   (US, Canada) A high, close-fitting collar, turned back on itself and covering all or most of the neck, on a sweater or similar garment.
2. •
   (US, Canada) Ellipsis of turtleneck sweater.

   • I've got billions and billions of rhymes to flex / 'Cause I've got more rhymes than Carl Sagan's got turtlenecks — 2004
3. •
   (slang) The foreskin.