This is performed by sticking your finger in your ass and then stirring that finger in someone's drink.
As you hand a girl a drink, you say "I gave that a Dirty Stir for you"
To have stirred someones dirty porridge is to realise that you and your brother/friend have had sex with the same girl
'stirring dirty porridge', an emotional short story by imthesean.
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1- 'Bro, me and Emma got it on last night'
'Emma from down the road?'
'Yeh man'
'But i had sex with her last week'
'O SHI-'
(3rd person) 'Baha! youve been stirring his dirty porridge!'
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