Subway Butt Share definition Flag adj. when your butt is all dirty from riding in the NYC subways Jeff: “Hey get off the clean hotel bed, you have a subway butt!” Sarah: “Okay, okay, I will!” Subway Butt by justthoughtiwouldshare May 22, 2020 0 0 Get merch Get the Subway Butt mug. Buy Now — $32.95 See more merch