Super Mega Ultra Shroom

A Super Mega Ultra Shroom is a Mushroom that was mentioned by Mimi in Super Paper Mario. It may be assumed that there is no such mushroom as Mimi was disguised as Merlee and was offering various things (similar to Hooktail) to Mario and his party, claiming she would give him it along with the Pure Heart if they signed a contract to pay ten million Rubees.

Trivia

 * The name of the mushroom is a combination of Super Shroom, Mega Mushroom, and Ultra Shroom, all but the second of which can be found in the Paper Mario series. Considering it was made up, it may also be a reference to Mimi's favorite TV show, Super Ultra Goomba Bros., another portmanteau of multiple Mushroom prefixes.