cornflake blast Share definition Flag A bowel movement that resembles dumping a large portion of cornflake type cereal into the toilet. After drinking all night and eating Taco Bell, Ernie left an enormous cornflake blast in the toilet. cornflake blast by Ernie November 25, 2003 0 0 Get merch Get the cornflake blast mug. Buy Now — $32.95 See more merch