Direct answer: The phrase “we can go M for M” is a slang line popularized by Central Cee and Lil Baby in the song BAND4BAND. It means escalating a comparison from thousands of dollars (a “band”) to millions of dollars (an “M”), i.e., matching or outdoing someone’s wealth at the higher, million- dollar level. In context, “band for band” refers to comparing bundles of money, while “M for M” pushes that comparison to the million-dollar scale rather than thousand-dollar bundles.