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A "Dirty Octopus" occurs when one has heaving bouts of diarrhea mixed with a lack of common decency and access to a (preferably crowded) swimming pool. Much like an octopus uses it's "ink" as a self defense/camouflaging mechanism, the subhuman who leaves a "Dirty Octopus" in the pool does so via projectile diarrhea whilst swimming below the surface thus leaving an ever expanding, anal shite cloud behind in their damaging wake causing inordinate amounts of psychically traumatic, human collateral damage.
Ah dude! I was holding my breath underwater when Dan blew a Dirty Octopus at me!!!
by The Somnambulist & Fast Reggie December 02, 2013
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