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When a person shoves any kind of string, regardless of thickness, through the crack of another and then pulls it out without any kind of warning.

This is also applicable to vaginas when done to a woman.
*Does a string rape to someone in his sleep*
String Rape Victim: DUDE! WHAT THE FUCK! That felt awkward!
Rapist: You are welcome!
by Cocostix October 16, 2011