three toed leprechaun

This is the regional name for a particular strain of hallucinogenic mushroom that is identified by its three distinctive slightly green colored lobes. When consumed in small quantities it is considered extremely hallucinogenic, but in large quantities it may cause dysentery and death. Some species of North American wildlife is known to consume this for recreational purposes.

Three toed leprechaun is a mushroom that causes hallucinations when consumed.

Example one: My neighbor's dog Leroy got into some of that three-toed leprechaun and was freaking out until he started crapping himself to death.
Example two: while forging for truffles and other wild mushrooms Melissa stumbled upon the elusive three-toed leprechaun fungi and partook of its particular medicinal and hallucinogenic quantities.