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Any bizarre, outlandish fetish. Usually a periox is an act of sodomy such as bestiality.

For instance:
Shemale fetishes
Foot fetishes
Sock fetishes
guy-analing-horse fetishes

are all considered to be perioxes whereas

granny fetishes
black guy & asian girl fetishes

are not perioxes.
-Dude Dave loves to watch women menstruate!
-What the hell? What kind of periox is that?

by bauB June 15, 2008
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