A girl who has macaroni and cheese nipples has abnormally long nipples and is lactating. The milk excreted from the nip dries around the end and oozes out uncontrollably, thus looking like day old macaroni and cheese.
Dan: "Dude does courtney have macaroni stuck on her chest?"
A classic American favorite cuisine. The "bro" insert is put in place simply when this dish is being consumed by a group of bros (young males generally characterized by open shirts, popped collars, mixed drinks, and unusually high self-confidence).
Asian girls who love black men, sometimes to the point of irrationality. "Macaroni" from the well worn theory that all blacks are macks and "Cheese" from the softness of asian female skin.