the best thing since sliced pan

Extremely good, wonderful, impressive, or revolutionary, often said facetiously or sarcastically. Taken from the more common expression "the best thing since sliced bread." In this usage, a pan, in which a loaf of bread is baked, refers to the loaf of bread itself. Primarily heard in Ireland. I don't care what you say, I think she's the best thing since sliced pan! This new smartphone design really is the best thing since sliced pan.