supercalifragilisticexpialadocious Share definition Flag Something quite atrocious; Exuberant; joyful; too much for words; "AHH!"; exciting. Ahhhhh supercalifragilisticexpialadocious dude! supercalifragilisticexpialadocious by some kid named mike April 20, 2005 Get the supercalifragilisticexpialadocious mug.