Fishy Snickers 

The act of simultaneously inserting your index finger into a woman's vagina and your middle finger into her anus, extracting, and then reversing your fingers, inserting the middle finger into her vagina and your index finger her anus.

Dude, smell my peace sign, I just gave that chick a fishy snickers.

Fishy Snickers by dash-y obliterate June 2, 2009