Lilakkiller3 Share definition Flag Lilakkiller3 is used for a peanut butter and sanwhich. It's Like ketchup but on a PB&J. Its also used when something is cool. Dude stupid shit, i dont want mayo on my sandwhich i want Lilakkiller3! Lilakkiller3 by Iamdodo March 12, 2008 0 0 Get merch Get the Lilakkiller3 mug. Buy Now — $32.95 See more merch