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1) Band kid humor describing failure of one to hit a particular note, ergo, a failure 2) A fail of epic proportions, described by a very loud pedal tone, saying "This is my wump..." and a tuba player with a monotone voice saying "Wump" 3) A play on Wumbo 4) A descriptive word for a very good time, day, or experience 5) The act of one putting their lips over the mouthpiece of a brass instrument, preferably sousaphone, tuba, contra, or baritone, and yelling as loud as humanly possible 6) If all else fails, the most accurate and precise definition of Wump is 42 7) God
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