For centuries the true definition of Tuna Sandwich has been lost until recently. Explorers discovered hyroglyphics covering the walls of the long lost pyramid of Barramundas. The only fish king to be mummified. The pictures adorning the walls were unwashed naked women with exotic vaginal adornments - that of the 99 cent tin of Tuna. As the explorers searched further up the walls they noticed that some of the unwashed women were having a snack on the said vaginal adornment, encasing it in 2 slices of bread.....

a sandwhich with tuna fish on it

eating out a woman on her period

A sandwich nobody wants, but everyone eats.

going down on a bleeding coochie

The tuna sandwich, not confused with its popular edible counterpart, is a term used with in gang societies, most notably used within Italian-American lore. When one asks if you would like a tuna sandwich it can mean two things, to congratulate a fellow man of a heralded feat, or more commonly a death wish towards whoever it is said. Only applicable if said in an Italian-American accent, if said plainly, it is just a request of literally eating a tuna sandwich.

Other versions of a tuna sandwich involve tuna melts, patty melts, or any combination of the two, such as a tuna patty melt. But one should be aware that at any time, if you're offered a "tuna patty melt" it is automatically a negative, life-threatening phrase.

When you slap someone, usually in response to a corn dog.