Pacifier
When you're fucking and change positions so that your dick gets pulled out of the hole you're using. To successfully get a Pacifier, you usually have to have, a big dick head, a tight hole, or be at an angle when you pull out. One, or any combination of the three, make a loud popping sound when you pop out. On The Simpsons, when Maggie's pacifier gets taken out, listen for the *POP!*
Kenny: Ohhh, baby your ass is sooo tight!
Brianne: Finish on my face!
*POP!*
Kenny: See??!?