A dirty piranha is a piece of sh*t shaped like a cock, and shoved up a girls vag. its then pissed on. then the girl will take it, and give it a blow job.
"YO NOAH, yesterday i took a shit and soved it up jasmines vag! and she pissed on it! then gave it a blow job!"

"ian, me and sydney did the same thing, its called a dirty piranha!"
by I.A.N. March 16, 2009
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