Uses the American English and British English pronunciations of the word tomato. Allusion to George Gershwin's song "Let's Call the Whole Thing Off": "You like tomato (/təˈmeɪtə/) and I like tomato (/təˈmɑːtə/)".
A: Then you hook the hose up to the bibcock, and you're done. B: You mean the sillcock. A: Tomayto, tomahto.
(idiomatic)Used to dismissively suggest that a particular distinction is a distinction without a difference; used to express the assertion that two similar things are effectively the same, despite any trivial difference.
A: Then you revise the database record for that transaction, and you're done. B: You mean you replace the old record with a new one. A: Tomayto, tomahto.
2009, N. B. Grace, Disney High School Musical: #1: Stories from East High Bind Up #1, Disney Press, →ISBN, page 78:
"Tomayto, tomahto," she said, and Taylor laughed. So they ended on a good note.