v. Close relative to the "Filthy Folletta" and sometime performed afterwards, A Reverse Filthmosis is performed when a drop of sweat that has beaded down a heavy set woman's ass crack and is caught by the tongue.
Dude I totally gave that huge bitch a Reverse Filthmosis.

You should have seen the look on her face when I gave her that Reverse Filthmosis.

Mom: "What did you learn in biology today?"
Boy: "Reverse Filthmosis."
by fattony8675309 March 21, 2009

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