Katie Butt Share definition Flag One who's butt is great. An eye-catcher that all guys want to grab. A bubble butt that is nicely shaped and a jaw-dropper. "That butt is wow! It must be a Katie butt." Katie Butt by danceforlife April 9, 2010 0 0 Get merch Get the Katie Butt mug. Buy Now — $32.95 See more merch