A negligible, trivial, or unimportant difference, distinction, or correction. (While "potahto" is not an accepted pronunciation in any English-speaking population, the phrase 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, potayto, potahto, who cares?"
n. the head. Put your hat on your potato, and let’s get out of here.