look up any word, like lemonparty:
A creature that can live on land or in water that at first appears to be a bizarre, twisted, knotty piece of tree branch or root. They can be any size but can be seen only under the influence of mind expanding substances or by children.
We went canoeing on mushrooms and saw many catapus along the banks of the Fox river.
by Follows Herons April 27, 2006