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1.
Something exclaimed by Wigglytuff of the Pokemon Mystery Dungeon versions: Time, Darkness, and Explorers of the Sky. Normally, this cry is followed an explosion of massive proportions, causing some to believe "Yoom-Tah!" is Wigglytuff's hypervoice attack.
"No perfect apples? YOOM-TAH!" (Blinding flash of light/ explosion)
by Chatot June 02, 2010
 
2.
a demented scream; as if by an animal
The cougar let out an ear-piercing yoom-tah.
by tazdiablo February 07, 2009