Great Valley High School

A sexual action, very similar to the Dirty Sanchez.

During doggystyle sex, the man puts his finger into the woman's anus, takes it out, and writes a "G" and a "V" on each of his cheeks. After this, the women licks her fecal matter off of his cheeks

Person 1: I just Great Valley High Schooled Sophie last night
Person 2: Awesome bro (fist bump)