BACKSPUBBLE Share definition Flag (bak' spuh bul)n. Dishwater that disappears down one drain of a double sink and comes up the other. The damn backspubble keeps coming up and getting all the dry ones in the dish drainer wet. BACKSPUBBLE by piyox420andreev August 18, 2010 0 0 Get merch Get the BACKSPUBBLE mug. Buy Now — $32.95 See more merch