"Coney Island butter” is another term for “mustard,” a condiment used on the popular Coney Island hot dogs. There is only one known print citation for “Coney Island butter” (in 1947), but it probably was a minor slang term in New York City at that time.
American Notes & Queries
“CONEY ISLAND BUTTER”: mustard; term overheard in New York rathskeller.
Dictionary of American Regional English, Vol. I, A-C
Frederic G. Cassidy, Chief Editor
Cambridge, MA: The Belknap Press of Harvard University Press
Coney Island butter n
1947 American Notes & Queries 7.86 NY, “Coney Island Butter”: mustard, term overheard in New York rathskeller.
New York City • Food/Drink • (0) Comments • Thursday, October 04, 2012 • Permalink