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1 definition by mike jones(same as the one above)

a big dark colored creature.although it may seem civilized it is just a ruse to trap bystanders and catch them unaware where its true colors are shown. note:umpede is mentioned as an 'it' however physically it seems like a male. Recently umpede has also been made into a musical, 'The Tale of Umpede' about a pathetic mourning creature.
T:Kermit the frog here, this is the tale of umpede.
R:UMPEDE!still wets the bed...cumon your 17 now, why do you still wets the sheets...

few lyrics from Tale of Umpede