ajective; pronounced: hew-gay-shuss; If an object or occurence is abnormally large, it is hugacious. You would want to use it when the word "huge" & the phrase "goodness gracious" comes to mind. "Goodness gracious that is huge!" turns into "That is hugacious!"
"Man, that Italian sumo wrestler guy about to eat Alex Trebek in one bite is hugacious."