chunk ass Share definition Flag Derogatory term for a person who has spent too much time eating junk food and not enough time exercising. The US is full of these people. "Whoaa! Fat Boy, you is a chunk ass - quit the cheeseburgers." chunk ass by Wizards Sleeve June 26, 2005 0 0 Get merch Get the chunk ass mug. Buy Now — $32.95 See more merch