A negligible, trivial, or unimportant difference, distinction, or correction. (Refers to the American pronunciation of tomato as "tomayto," compared with the British pronunciation of "tomahto." Specifically, it is an allusion to a verse in the song "Let's Call the Whole Thing Off": "You like potayto, I like potahto; you like tomayto, I like tomahto; potayto, potahto, tomayto, tomahto, let's call the whole thing off!") A: "Well, technically, the Hindenburg was a rigid airship, not a blimp." B: "Eh, tomayto, tomahto. What difference does it make?"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.