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1.
When one sorority girl slides her fingers / hand inside another sorority girl's vagina during the passion of their lesbian encounter.
Girl 1: That sex we had last night was hot
Girl 2: I especially enjoyed the Sorority Handshake
by J "Assman" T March 01, 2011
 
2.
The insertion of at least 3 fingers (up to, and inclusive of, the insertion of the entire open hand) into the vagina of one woman by another woman
Louie- Wow! She gave her a full Sorority Handshake, I says!

AC- My favorite thing in the entire world!
by Lou Skunt March 17, 2011