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1.
The natural mixture of male fecal matter and semen.
"You're gayer than an oreo milkshake."

"Hey... is that shit on your floor? And cum?! Fan-fucking-tastic, dude you made an oreo milkshake... I'm probably never gonna talk to you again."
by youdontevenwannaknow March 19, 2010
 
2.
When a man poops and the ejaculates in a women's mouth, she then chews up the mixture, making it resemble an oreo milkshake.
I gave her a oreo milkshake last night, she loved it.
by RBertrand December 30, 2007