from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Seafood and beefsteak served as the main course of a meal, as in a restaurant.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A meal that combines seafood and meat, typically shrimp and steak.
From the environments of the animals used in its preparation (surf being the sea and turf the land), chosen for the rhyme. The earliest-known published use is in a 1967 advertisement in the Buffalo, New York Yellow Pages, placed by a restaurant called Michael's House of Steaks. (Wiktionary)