Yumtasticalicious Share definition Flag Derived from the words "Yummy", "Fantastic", and "Delicious". Used to describe something or someone awesome. But the first use of the word was to describe Skyline Chili. Man, Skyline Chili is sure Yumtasticalicious. Yumtasticalicious by $lim $hady February 22, 2009 Get the Yumtasticalicious mug.