When a girl has her vagina and anus licked at the same time by two different individuals. This act is a prerequisite to the Eiffel Tower.
Although the word 'buffet' is used, this act is most often an appetizer to the more enjoyable Eiffel Tower. Although which act is more enjoyable is debatable.
Scott and Ben enjoyed an all you can eat Surf N' Turf Buffet with the drunk girl from the bar. Scott called dibs on her ass.
A fancy dual entree meal. "Trailer park surf n turf" is two main dishes, say tuna casserole and hot dogs, together. One of the main dishes is fish (surf) and the other meat (turf). In a more elevated atmosphere it might consist of lobster and steak. Alternatives could be: frozen fish sticks, spam, catfish, baloney, etc.
Jared: Last night was fucking crazy man!
Steve: Why bro?
Jared: Cuz I was pounding your sisters taco with my man hammer and your girlfriend came in and started licking my bitches pussy and my dick at the same time!
Steve: aw, the old Surf N Turf?