To deliberately and surreptitiously cause defect to a prophylactic with the aspiration to impregnate or be impregnated as a result of ulterior motives.
Freg: Hey Sturbs, did you hear Hobbie knocked up Waura?
Hason: No way! What are they going to do?
Freg: Well, I think her family has crazy money.
Hason: That turtlenecking sonofabitch!
When two males, one who is uncircumcised, go pole-to-pole (head to head) and the uncircumcised guy pulls his foreskin over the head of the other guy's head.
My friend said his head was cold so I provided him with a custom, all-natural turtleneck. The next thing I knew, we were turtlenecking.