Diving slowly; the opposite of driving at breakneck pace.
"The driver in front of me is driving at Turtleneck pace."
Friends who are uncircumcised and are aware of the fact.
"Those guys are way too open with each other. They're turtleneck buddies."
When a man finishes inside a girls turtleneck and she wears it for the rest of the day.
I gave my girl a wet turtleneck before work, no one knew she had my load under there all day!
When you're wearing a turtleneck, but your neck is too short for the shirt, so you look like a tool.
Lauren: Hey dude, nice turtleneck.
Kevin: Thanks. It doesn't fit me very well.
Lauren: Oh man, you've got some mad turtleneck overflow.
When an uncircumcised penis touches tip-to-tip with a circumcised penis and blankets the head with its foreskin. Similar to a Chinese finger trap!
Chad: Dude, did you hear what Heath and Jake did this weekend?
Noah: No, man what happened?
Chad: Heath was passed out at the party and Jake took off his pants and gave him a turtleneck blanket!
Noah: Radical.