The act of shitting in someone’s mouth while they sleep and jerking off as they spit it out of their mouth.
Guy 1: “Dude did you just dirty portia me?”

Guy 2: Fap Fap Fap Fap
by Ted_Mosby_Architect August 24, 2021
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When you dress up as a horse and stuff bree in to you own anus untill it melts so you can fluctuate bree bubbles whilst masterbating
Person1: why does it stick of cheese.
Person2: oh I had some spare bree and fancied a dirty portia.

Example 2

I was watching the dressage last night with a cheese board and remembered that time I got introduced to a dirty portia.
by jingle joy August 7, 2021
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