The act of making love to a woman during that "special time" of the month.
That girl I copped off with last night, turned out she was up on blocks. Still, spot of stirring the paint never did anyone any harm. Knob looked like something off a butcher's slab afterwards, mind!
by eXOBeX February 19, 2011
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Have sex with a girl on her period.
Bloke 1: Dude, that skank I was nailing last night was on her jam rag!

Bloke 2: Stirring the paint, that's rank man.
by Cunto McGee October 5, 2011
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Banging your girl, filthy dirty raw, whilst she's on her period.
Aaron was Stirring the paint on Stephanie, dude, his balls were dripping wet with blood like the halls on the shining. He wore a pad for a week too.
by Milky bussoms October 29, 2017
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Having sex with a woman while she's on her period.
Stir the paint is having sex with a woman while she's on her period, not one her period--ON her period fucknuts!
by Rocket1 February 6, 2012
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Using a finger (or two) to simulate penetrative sex on a female during her period.
She won't even let me stir the paint during her period.
by LexLuther85 August 19, 2018
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Having sex with a woman while she's one her period.
It's Susan's time of the month again, I hope she'll let me stir the paint tonight.
by Harry Bullocks October 3, 2011
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