Bunsta Share definition Flag A word put in front of another word to substitute it and replace the first letter of the word with a b and an l. "Hey lets play the penis game!" instead it would be"Hey lets play the bunstablenis game!" Bunsta by Smiley@34 September 21, 2009 0 0 Get merch Get the Bunsta mug. Buy Now — $32.95 See more merch