Sideways Sloppy-Joe Share definition Flag Analogous to the vagina--may be used in the context of an extremely loose (sloppy) vagina. With all the cock that girl swallows, it's no wonder she's got a sideways sloppy-joe. Sideways Sloppy-Joe by Shane December 9, 2004 0 0 Get merch Get the Sideways Sloppy-Joe mug. Buy Now — $32.95 See more merch