Adultimatum Share definition Flag An ultimatum given to a child by an adult, commonly to get the child to do something and stop them being a little bitch "My son wouldn't put on his shoes, so I gave him an adultimatum and it worked a treat" Adultimatum by The one true Neo February 1, 2015 0 0 Get merch Get the Adultimatum mug. Buy Now — $32.95 See more merch