String Pop 

Banging a vagina and pulling out their tampon on your penis.

Me and your sister made a string pop last night

String Pop by Jack March 6, 2004

String Pop 

Pulling a tampon out of a girl's vagina with your teeth during heavy menstrual flow

Eugene said to Paul, "last night when I went down on that ho, she was on the rag...I said fuck it, and String Popped the bitch."

String Pop by B-dogger September 1, 2008