stirring dirty porridge
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!'