Top Definition
noun. A form of excretion that leaves a large mess, and often a simultaneous disgusting smell. 'RingSting' or, in extreme cases blood loss is a common side-effect.
Mackin: "what's that you've left in my toilet"

Wiggles: "sorry, i just had an absolute horrendapoo"

(Mackin begins look of disgust)
by Wigglypoo February 22, 2009
5 Words related to Horrendapoo

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