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When one has to shit so bad they leave the party.
" Hey where's Johnny? Hes up next on beer pong!"

Oh, He's not here..I think he dumpset!"
by butts3000 April 28, 2011
Defecating in a toliet while dipping.
Vincent: Would you like to take a dumpset before practice?
Louis: I would be honored, I have some grape Yakk.
by NOGGIL_AHS March 16, 2010