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1.
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."
by B-dogger June 07, 2006
 
2.
Banging a vagina and pulling out their tampon on your penis.
Me and your sister made a string pop last night
by Jack March 06, 2004